diff --git a/samples/RecaptchaMVCSample/App_Start/FilterConfig.cs b/samples/RecaptchaMVCSample/App_Start/FilterConfig.cs
index 8c7bfbb..a1c4935 100644
--- a/samples/RecaptchaMVCSample/App_Start/FilterConfig.cs
+++ b/samples/RecaptchaMVCSample/App_Start/FilterConfig.cs
@@ -1,4 +1,9 @@
-using System.Web;
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System.Web;
 using System.Web.Mvc;
 
 namespace RecaptchaMVCSample
diff --git a/samples/RecaptchaMVCSample/App_Start/RouteConfig.cs b/samples/RecaptchaMVCSample/App_Start/RouteConfig.cs
index cff2e3f..f698d48 100644
--- a/samples/RecaptchaMVCSample/App_Start/RouteConfig.cs
+++ b/samples/RecaptchaMVCSample/App_Start/RouteConfig.cs
@@ -1,4 +1,9 @@
-using System;
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
diff --git a/samples/RecaptchaMVCSample/App_Start/WebApiConfig.cs b/samples/RecaptchaMVCSample/App_Start/WebApiConfig.cs
index af7cc71..4122b67 100644
--- a/samples/RecaptchaMVCSample/App_Start/WebApiConfig.cs
+++ b/samples/RecaptchaMVCSample/App_Start/WebApiConfig.cs
@@ -1,4 +1,8 @@
-using System;
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web.Http;
diff --git a/samples/RecaptchaMVCSample/Controllers/HomeController.cs b/samples/RecaptchaMVCSample/Controllers/HomeController.cs
index 42c6e59..c7f0bef 100644
--- a/samples/RecaptchaMVCSample/Controllers/HomeController.cs
+++ b/samples/RecaptchaMVCSample/Controllers/HomeController.cs
@@ -23,7 +23,7 @@ public ActionResult Index()
         }
 
         [HttpPost]
-        public async Task<ActionResult> Index(UserRegistrationModel model)
+        public ActionResult Index(UserRegistrationModel model)
         {
             var recaptchaHelper = this.GetRecaptchaVerificationHelper();
 
@@ -33,7 +33,7 @@ public async Task<ActionResult> Index(UserRegistrationModel model)
                 return View(model);
             }
 
-            var recaptchaResult = await recaptchaHelper.VerifyRecaptchaResponseTaskAsync();
+            var recaptchaResult = recaptchaHelper.VerifyRecaptchaResponse();
 
             if (recaptchaResult != RecaptchaVerificationResult.Success)
             {
diff --git a/samples/RecaptchaMVCSample/Global.asax.cs b/samples/RecaptchaMVCSample/Global.asax.cs
index d79e1b7..aaa1409 100644
--- a/samples/RecaptchaMVCSample/Global.asax.cs
+++ b/samples/RecaptchaMVCSample/Global.asax.cs
@@ -1,4 +1,9 @@
-using System;
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
@@ -8,8 +13,6 @@
 
 namespace RecaptchaMVCSample
 {
-    // Note: For instructions on enabling IIS6 or IIS7 classic mode, 
-    // visit http://go.microsoft.com/?LinkId=9394801
     public class MvcApplication : System.Web.HttpApplication
     {
         protected void Application_Start()
diff --git a/samples/RecaptchaMVCSample/Models/UserRegistrationModel.cs b/samples/RecaptchaMVCSample/Models/UserRegistrationModel.cs
index f0459a2..c2562ae 100644
--- a/samples/RecaptchaMVCSample/Models/UserRegistrationModel.cs
+++ b/samples/RecaptchaMVCSample/Models/UserRegistrationModel.cs
@@ -1,4 +1,9 @@
-using System;
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
 using System.Linq;
diff --git a/samples/RecaptchaMVCSample/Properties/AssemblyInfo.cs b/samples/RecaptchaMVCSample/Properties/AssemblyInfo.cs
index cd3e67a..8d34825 100644
--- a/samples/RecaptchaMVCSample/Properties/AssemblyInfo.cs
+++ b/samples/RecaptchaMVCSample/Properties/AssemblyInfo.cs
@@ -1,4 +1,9 @@
-using System.Reflection;
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
@@ -31,5 +36,5 @@
 //
 // You can specify all the values or you can default the Revision and Build Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.8.0.0")]
-[assembly: AssemblyFileVersion("1.8.0.0")]
+[assembly: AssemblyVersion("2.0.0.0")]
+[assembly: AssemblyFileVersion("2.0.0.0")]
diff --git a/samples/RecaptchaMVCSample/RecaptchaMVCSample.csproj b/samples/RecaptchaMVCSample/RecaptchaMVCSample.csproj
index e0bcbfb..cdd4ac9 100644
--- a/samples/RecaptchaMVCSample/RecaptchaMVCSample.csproj
+++ b/samples/RecaptchaMVCSample/RecaptchaMVCSample.csproj
@@ -44,16 +44,12 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.CSharp" />
-    <Reference Include="Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Newtonsoft.Json.6.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Data" />
     <Reference Include="System.Drawing" />
-    <Reference Include="System.Net.Http.Formatting, Version=5.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+    <Reference Include="System.Net.Http.Formatting, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebApi.Client.5.2.0\lib\net45\System.Net.Http.Formatting.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebApi.Client.5.2.3\lib\net45\System.Net.Http.Formatting.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.DynamicData" />
     <Reference Include="System.Web.Entity" />
@@ -63,35 +59,35 @@
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="System.Web.Helpers, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.Helpers.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.Helpers.dll</HintPath>
     </Reference>
-    <Reference Include="System.Web.Http, Version=5.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+    <Reference Include="System.Web.Http, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebApi.Core.5.2.0\lib\net45\System.Web.Http.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebApi.Core.5.2.3\lib\net45\System.Web.Http.dll</HintPath>
     </Reference>
-    <Reference Include="System.Web.Http.WebHost, Version=5.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+    <Reference Include="System.Web.Http.WebHost, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebApi.WebHost.5.2.0\lib\net45\System.Web.Http.WebHost.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebApi.WebHost.5.2.3\lib\net45\System.Web.Http.WebHost.dll</HintPath>
     </Reference>
-    <Reference Include="System.Web.Mvc, Version=5.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+    <Reference Include="System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.Mvc.5.2.0\lib\net45\System.Web.Mvc.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.Mvc.5.2.3\lib\net45\System.Web.Mvc.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.Razor.3.2.0\lib\net45\System.Web.Razor.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.Razor.3.2.3\lib\net45\System.Web.Razor.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages.Deployment, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.Deployment.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.Deployment.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.Razor.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.Razor.dll</HintPath>
     </Reference>
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Web" />
diff --git a/samples/RecaptchaMVCSample/Views/Home/Index.cshtml b/samples/RecaptchaMVCSample/Views/Home/Index.cshtml
index 6c04f8c..f6c8f1d 100644
--- a/samples/RecaptchaMVCSample/Views/Home/Index.cshtml
+++ b/samples/RecaptchaMVCSample/Views/Home/Index.cshtml
@@ -1,4 +1,11 @@
-@{
+@*
+* ============================================================================================================================
+* THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+* LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+* ===========================================================================================================================
+*@
+
+@{
     Layout = "~/Views/Shared/_Layout.cshtml";
 }
 
diff --git a/samples/RecaptchaMVCSample/Views/Home/Welcome.cshtml b/samples/RecaptchaMVCSample/Views/Home/Welcome.cshtml
index 79bb1f3..83a4608 100644
--- a/samples/RecaptchaMVCSample/Views/Home/Welcome.cshtml
+++ b/samples/RecaptchaMVCSample/Views/Home/Welcome.cshtml
@@ -1,4 +1,11 @@
-@{
+@*
+    * ============================================================================================================================
+    * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+    * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+    * ===========================================================================================================================
+*@
+
+@{
     Layout = "~/Views/Shared/_Layout.cshtml";
 }
 
diff --git a/samples/RecaptchaMVCSample/Views/Shared/_Layout.cshtml b/samples/RecaptchaMVCSample/Views/Shared/_Layout.cshtml
index 84071db..126c2cd 100644
--- a/samples/RecaptchaMVCSample/Views/Shared/_Layout.cshtml
+++ b/samples/RecaptchaMVCSample/Views/Shared/_Layout.cshtml
@@ -1,4 +1,11 @@
-@{
+@*
+    * ============================================================================================================================
+    * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+    * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+    * ===========================================================================================================================
+*@
+
+@{
     Layout = null;
 }
 
diff --git a/samples/RecaptchaMVCSample/Web.config b/samples/RecaptchaMVCSample/Web.config
index 3cafe63..c2d5000 100644
--- a/samples/RecaptchaMVCSample/Web.config
+++ b/samples/RecaptchaMVCSample/Web.config
@@ -1,8 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-  For more information on how to configure your ASP.NET application, please visit
-  http://go.microsoft.com/fwlink/?LinkId=169433
-  -->
+ * ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * ===========================================================================================================================
+-->
 <configuration>
   <appSettings>
     <add key="webpages:Version" value="2.0.0.0" />
@@ -10,10 +12,12 @@
     <add key="PreserveLoginUrl" value="true" />
     <add key="ClientValidationEnabled" value="true" />
     <add key="UnobtrusiveJavaScriptEnabled" value="true" />
-    <!-- Your site key for reCAPTCHA-->
+    <!-- Your public key (site key) for your reCAPTCHA control -->
     <add key="recaptchaPublicKey" value="" />
-    <!-- Your secret key for reCAPTCHA -->
+    <!-- Your private key (secret key) for your reCAPTCHA control -->
     <add key="recaptchaPrivateKey" value="" />
+    <!-- reCAPTCHA version. Possible values are: 1 and 2. Default is 1. -->
+    <add key="recaptchaApiVersion" value="2" />
   </appSettings>
   <system.web>
     <httpRuntime targetFramework="4.5" />
@@ -50,32 +54,32 @@
         <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
       </dependentAssembly>
       <dependentAssembly>
-        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
-        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
+        <assemblyIdentity name="System.Web.WebPages.Razor" publicKeyToken="31bf3856ad364e35" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
       </dependentAssembly>
       <dependentAssembly>
-        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
-        <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
+        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-7.0.0.0" newVersion="7.0.0.0" />
       </dependentAssembly>
       <dependentAssembly>
-        <assemblyIdentity name="System.Web.WebPages.Razor" publicKeyToken="31bf3856ad364e35" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
+        <assemblyIdentity name="System.Net.Http.Formatting" publicKeyToken="31bf3856ad364e35" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
       </dependentAssembly>
       <dependentAssembly>
-        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
-        <bindingRedirect oldVersion="1.0.0.0-5.2.0.0" newVersion="5.2.0.0" />
+        <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
       </dependentAssembly>
       <dependentAssembly>
-        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
+        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
+        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
       </dependentAssembly>
       <dependentAssembly>
-        <assemblyIdentity name="System.Net.Http.Formatting" publicKeyToken="31bf3856ad364e35" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-5.2.0.0" newVersion="5.2.0.0" />
+        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
+        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
       </dependentAssembly>
       <dependentAssembly>
-        <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-5.2.0.0" newVersion="5.2.0.0" />
+        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
+        <bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
       </dependentAssembly>
     </assemblyBinding>
   </runtime>
diff --git a/samples/RecaptchaMVCSample/packages.config b/samples/RecaptchaMVCSample/packages.config
index c4223d6..65aa0a4 100644
--- a/samples/RecaptchaMVCSample/packages.config
+++ b/samples/RecaptchaMVCSample/packages.config
@@ -1,13 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+ * ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * ===========================================================================================================================
+-->
 <packages>
-  <package id="Microsoft.AspNet.Mvc" version="5.2.0" targetFramework="net45" />
-  <package id="Microsoft.AspNet.Razor" version="3.2.0" targetFramework="net45" />
-  <package id="Microsoft.AspNet.WebApi" version="5.2.0" targetFramework="net45" />
-  <package id="Microsoft.AspNet.WebApi.Client" version="5.2.0" targetFramework="net45" />
-  <package id="Microsoft.AspNet.WebApi.Core" version="5.2.0" targetFramework="net45" />
-  <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.0" targetFramework="net45" />
-  <package id="Microsoft.AspNet.WebPages" version="3.2.0" targetFramework="net45" />
+  <package id="Microsoft.AspNet.Mvc" version="5.2.3" targetFramework="net45" />
+  <package id="Microsoft.AspNet.Razor" version="3.2.3" targetFramework="net45" />
+  <package id="Microsoft.AspNet.WebApi" version="5.2.3" targetFramework="net45" />
+  <package id="Microsoft.AspNet.WebApi.Client" version="5.2.3" targetFramework="net45" />
+  <package id="Microsoft.AspNet.WebApi.Core" version="5.2.3" targetFramework="net45" />
+  <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.3" targetFramework="net45" />
+  <package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net45" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="4.5.11" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="6.0.3" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/samples/RecaptchaWebFormSample/Default.aspx b/samples/RecaptchaWebFormSample/Default.aspx
index 1ca7a20..5f09e1f 100644
--- a/samples/RecaptchaWebFormSample/Default.aspx
+++ b/samples/RecaptchaWebFormSample/Default.aspx
@@ -1,4 +1,10 @@
-<%@ Page Language="C#" Async="true" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="RecaptchaWebFormSample.Default" %>
+<!--
+ * ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * ===========================================================================================================================
+-->
+<%@ Page Language="C#" Async="true" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="RecaptchaWebFormSample.Default" %>
 
 <%@ Register Assembly="Recaptcha.Web" Namespace="Recaptcha.Web.UI.Controls" TagPrefix="cc1" %>
 
diff --git a/samples/RecaptchaWebFormSample/Default.aspx.cs b/samples/RecaptchaWebFormSample/Default.aspx.cs
index 8e30030..0e8dcba 100644
--- a/samples/RecaptchaWebFormSample/Default.aspx.cs
+++ b/samples/RecaptchaWebFormSample/Default.aspx.cs
@@ -20,7 +20,7 @@ protected void Page_Load(object sender, EventArgs e)
 
         }
 
-        protected async void btnSubmit_Click(object sender, EventArgs e)
+        protected void btnSubmit_Click(object sender, EventArgs e)
         {
             if (String.IsNullOrEmpty(Recaptcha1.Response))
             {
@@ -28,7 +28,7 @@ protected async void btnSubmit_Click(object sender, EventArgs e)
             }
             else
             {
-                RecaptchaVerificationResult result = await Recaptcha1.VerifyTaskAsync();
+                RecaptchaVerificationResult result = Recaptcha1.Verify();
 
                 if (result == RecaptchaVerificationResult.Success)
                 {
diff --git a/samples/RecaptchaWebFormSample/Properties/AssemblyInfo.cs b/samples/RecaptchaWebFormSample/Properties/AssemblyInfo.cs
index c15ecc7..ec35b36 100644
--- a/samples/RecaptchaWebFormSample/Properties/AssemblyInfo.cs
+++ b/samples/RecaptchaWebFormSample/Properties/AssemblyInfo.cs
@@ -1,4 +1,9 @@
-using System.Reflection;
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
@@ -31,5 +36,5 @@
 //
 // You can specify all the values or you can default the Revision and Build Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.8.0.0")]
-[assembly: AssemblyFileVersion("1.8.0.0")]
+[assembly: AssemblyVersion("2.0.0.0")]
+[assembly: AssemblyFileVersion("2.0.0.0")]
diff --git a/samples/RecaptchaWebFormSample/RecaptchaWebFormSample.csproj b/samples/RecaptchaWebFormSample/RecaptchaWebFormSample.csproj
index 3f51a86..4b83a57 100644
--- a/samples/RecaptchaWebFormSample/RecaptchaWebFormSample.csproj
+++ b/samples/RecaptchaWebFormSample/RecaptchaWebFormSample.csproj
@@ -58,27 +58,27 @@
     <Reference Include="System.Web.Extensions" />
     <Reference Include="System.Web.Helpers, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.Helpers.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.Helpers.dll</HintPath>
     </Reference>
-    <Reference Include="System.Web.Mvc, Version=5.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+    <Reference Include="System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.Mvc.5.2.0\lib\net45\System.Web.Mvc.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.Mvc.5.2.3\lib\net45\System.Web.Mvc.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.Razor.3.2.0\lib\net45\System.Web.Razor.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.Razor.3.2.3\lib\net45\System.Web.Razor.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages.Deployment, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.Deployment.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.Deployment.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.Razor.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.Razor.dll</HintPath>
     </Reference>
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Drawing" />
diff --git a/samples/RecaptchaWebFormSample/Web.config b/samples/RecaptchaWebFormSample/Web.config
index 9a02a33..29cc137 100644
--- a/samples/RecaptchaWebFormSample/Web.config
+++ b/samples/RecaptchaWebFormSample/Web.config
@@ -1,32 +1,36 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-  For more information on how to configure your ASP.NET application, please visit
-  http://go.microsoft.com/fwlink/?LinkId=169433
-  -->
+ * ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * ============================================================================================================================
+-->
 <configuration>
   <appSettings>
-    <!-- Your site key for reCAPTCHA-->
+    <!-- Your public key (site key) for your reCAPTCHA control -->
     <add key="recaptchaPublicKey" value="" />
-    <!-- Your secret key for reCAPTCHA -->
+    <!-- Your private key (secret key) for your reCAPTCHA control -->
     <add key="recaptchaPrivateKey" value="" />
+    <!-- reCAPTCHA version. Possible values are: 1 and 2. Default is 1. -->
+    <add key="recaptchaApiVersion" value="2" />
   </appSettings>
   <system.web>
-    <compilation debug="true" targetFramework="4.5" />
-    <httpRuntime targetFramework="4.5" />
+    <compilation debug="true" targetFramework="4.5"/>
+    <httpRuntime targetFramework="4.5"/>
   </system.web>
   <runtime>
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
       <dependentAssembly>
-        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
-        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
+        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35"/>
+        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
       </dependentAssembly>
       <dependentAssembly>
-        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
-        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
+        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35"/>
+        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
       </dependentAssembly>
       <dependentAssembly>
-        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
-        <bindingRedirect oldVersion="1.0.0.0-5.2.0.0" newVersion="5.2.0.0" />
+        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35"/>
+        <bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0"/>
       </dependentAssembly>
     </assemblyBinding>
   </runtime>
diff --git a/samples/RecaptchaWebFormSample/Welcome.aspx b/samples/RecaptchaWebFormSample/Welcome.aspx
index 976efa9..d3a3a5b 100644
--- a/samples/RecaptchaWebFormSample/Welcome.aspx
+++ b/samples/RecaptchaWebFormSample/Welcome.aspx
@@ -1,4 +1,10 @@
-<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Welcome.aspx.cs" Inherits="RecaptchaWebFormSample.Welcome" %>
+<!--
+ * ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * ===========================================================================================================================
+-->
+<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Welcome.aspx.cs" Inherits="RecaptchaWebFormSample.Welcome" %>
 
 <!DOCTYPE html>
 
diff --git a/samples/RecaptchaWebFormSample/packages.config b/samples/RecaptchaWebFormSample/packages.config
index c5cad21..5204042 100644
--- a/samples/RecaptchaWebFormSample/packages.config
+++ b/samples/RecaptchaWebFormSample/packages.config
@@ -1,7 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+ * ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * ===========================================================================================================================
+-->
 <packages>
-  <package id="Microsoft.AspNet.Mvc" version="5.2.0" targetFramework="net45" />
-  <package id="Microsoft.AspNet.Razor" version="3.2.0" targetFramework="net45" />
-  <package id="Microsoft.AspNet.WebPages" version="3.2.0" targetFramework="net45" />
+  <package id="Microsoft.AspNet.Mvc" version="5.2.3" targetFramework="net45" />
+  <package id="Microsoft.AspNet.Razor" version="3.2.3" targetFramework="net45" />
+  <package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net45" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/Recaptcha.Web.4.0/Properties/AssemblyInfo.cs b/src/Recaptcha.Web.4.0/Properties/AssemblyInfo.cs
index ff224f7..aef3598 100644
--- a/src/Recaptcha.Web.4.0/Properties/AssemblyInfo.cs
+++ b/src/Recaptcha.Web.4.0/Properties/AssemblyInfo.cs
@@ -1,4 +1,9 @@
-using System.Reflection;
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
@@ -32,5 +37,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.8.0.0")]
-[assembly: AssemblyFileVersion("1.8.0.0")]
+[assembly: AssemblyVersion("2.0.0.0")]
+[assembly: AssemblyFileVersion("2.0.0.0")]
diff --git a/src/Recaptcha.Web.4.0/Recaptcha.Web.4.0.csproj b/src/Recaptcha.Web.4.0/Recaptcha.Web.4.0.csproj
index cb69307..666bfba 100644
--- a/src/Recaptcha.Web.4.0/Recaptcha.Web.4.0.csproj
+++ b/src/Recaptcha.Web.4.0/Recaptcha.Web.4.0.csproj
@@ -39,41 +39,39 @@
     <SignAssembly>true</SignAssembly>
   </PropertyGroup>
   <PropertyGroup>
-    <AssemblyOriginatorKeyFile>
-    </AssemblyOriginatorKeyFile>
+    <AssemblyOriginatorKeyFile>Recaptcha.pfx</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <Private>True</Private>
       <HintPath>..\packages\Microsoft.Web.Infrastructure.1.0.0.0\lib\net40\Microsoft.Web.Infrastructure.dll</HintPath>
     </Reference>
+    <Reference Include="Newtonsoft.Json">
+      <HintPath>..\packages\Newtonsoft.Json.7.0.1\lib\net40\Newtonsoft.Json.dll</HintPath>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.configuration" />
     <Reference Include="System.Core" />
     <Reference Include="System.Web" />
     <Reference Include="System.Web.Helpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <Private>True</Private>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.2.0.20710.0\lib\net40\System.Web.Helpers.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.2.0.30506.0\lib\net40\System.Web.Helpers.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <Private>True</Private>
-      <HintPath>..\packages\Microsoft.AspNet.Mvc.4.0.20710.0\lib\net40\System.Web.Mvc.dll</HintPath>
-    </Reference>
-    <Reference Include="System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <Private>True</Private>
-      <HintPath>..\packages\Microsoft.AspNet.Razor.2.0.20710.0\lib\net40\System.Web.Razor.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.Mvc.4.0.30506.0\lib\net40\System.Web.Mvc.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <Private>True</Private>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.2.0.20710.0\lib\net40\System.Web.WebPages.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.2.0.30506.0\lib\net40\System.Web.WebPages.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages.Deployment, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <Private>True</Private>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.2.0.20710.0\lib\net40\System.Web.WebPages.Deployment.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.2.0.30506.0\lib\net40\System.Web.WebPages.Deployment.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <Private>True</Private>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.2.0.20710.0\lib\net40\System.Web.WebPages.Razor.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.2.0.30506.0\lib\net40\System.Web.WebPages.Razor.dll</HintPath>
     </Reference>
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
@@ -82,12 +80,24 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="..\Recaptcha.Web\IRecaptchaHtmlHelper.cs">
+      <Link>IRecaptchaHtmlHelper.cs</Link>
+    </Compile>
     <Compile Include="..\Recaptcha.Web\Mvc\RecaptchaMvcExtensions.cs">
       <Link>Mvc\RecaptchaMvcExtensions.cs</Link>
     </Compile>
+    <Compile Include="..\Recaptcha.Web\Recaptcha2HtmlHelper.cs">
+      <Link>Recaptcha2HtmlHelper.cs</Link>
+    </Compile>
+    <Compile Include="..\Recaptcha.Web\Recaptcha2VerificationResult.cs">
+      <Link>Recaptcha2VerificationResult.cs</Link>
+    </Compile>
     <Compile Include="..\Recaptcha.Web\RecaptchaHtmlHelper.cs">
       <Link>RecaptchaHtmlHelper.cs</Link>
     </Compile>
+    <Compile Include="..\Recaptcha.Web\RecaptchaHtmlHelperBase.cs">
+      <Link>RecaptchaHtmlHelperBase.cs</Link>
+    </Compile>
     <Compile Include="..\Recaptcha.Web\RecaptchaKeyHelper.cs">
       <Link>RecaptchaKeyHelper.cs</Link>
     </Compile>
@@ -110,6 +120,7 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
+    <None Include="Recaptcha.pfx" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
diff --git a/src/Recaptcha.Web.4.0/packages.config b/src/Recaptcha.Web.4.0/packages.config
index c524020..ab7329d 100644
--- a/src/Recaptcha.Web.4.0/packages.config
+++ b/src/Recaptcha.Web.4.0/packages.config
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="AspNetMvc" version="4.0.20710.0" targetFramework="net40" />
-  <package id="Microsoft.AspNet.Mvc" version="4.0.20710.0" targetFramework="net40" />
-  <package id="Microsoft.AspNet.Razor" version="2.0.20710.0" targetFramework="net40" />
-  <package id="Microsoft.AspNet.WebPages" version="2.0.20710.0" targetFramework="net40" />
+  <package id="Microsoft.AspNet.Mvc" version="4.0.30506.0" targetFramework="net40" />
+  <package id="Microsoft.AspNet.WebPages" version="2.0.30506.0" targetFramework="net40" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net40" />
+  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net40" />
 </packages>
\ No newline at end of file
diff --git a/src/Recaptcha.Web.4.5.1/Properties/AssemblyInfo.cs b/src/Recaptcha.Web.4.5.1/Properties/AssemblyInfo.cs
index 53baa86..0249d62 100644
--- a/src/Recaptcha.Web.4.5.1/Properties/AssemblyInfo.cs
+++ b/src/Recaptcha.Web.4.5.1/Properties/AssemblyInfo.cs
@@ -1,4 +1,9 @@
-using System.Reflection;
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
@@ -32,5 +37,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.8.0.0")]
-[assembly: AssemblyFileVersion("1.8.0.0")]
+[assembly: AssemblyVersion("2.0.0.0")]
+[assembly: AssemblyFileVersion("2.0.0.0")]
diff --git a/src/Recaptcha.Web.4.5.1/Recaptcha.Web.4.5.1.csproj b/src/Recaptcha.Web.4.5.1/Recaptcha.Web.4.5.1.csproj
index eb1ca38..3afacec 100644
--- a/src/Recaptcha.Web.4.5.1/Recaptcha.Web.4.5.1.csproj
+++ b/src/Recaptcha.Web.4.5.1/Recaptcha.Web.4.5.1.csproj
@@ -39,41 +39,43 @@
     <SignAssembly>true</SignAssembly>
   </PropertyGroup>
   <PropertyGroup>
-    <AssemblyOriginatorKeyFile>
-    </AssemblyOriginatorKeyFile>
+    <AssemblyOriginatorKeyFile>Recaptcha.pfx</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <Private>True</Private>
       <HintPath>..\packages\Microsoft.Web.Infrastructure.1.0.0.0\lib\net40\Microsoft.Web.Infrastructure.dll</HintPath>
     </Reference>
+    <Reference Include="Newtonsoft.Json">
+      <HintPath>..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.configuration" />
     <Reference Include="System.Core" />
     <Reference Include="System.Web" />
     <Reference Include="System.Web.Helpers, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.Helpers.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.Helpers.dll</HintPath>
     </Reference>
-    <Reference Include="System.Web.Mvc, Version=5.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+    <Reference Include="System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.Mvc.5.2.0\lib\net45\System.Web.Mvc.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.Mvc.5.2.3\lib\net45\System.Web.Mvc.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.Razor.3.2.0\lib\net45\System.Web.Razor.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.Razor.3.2.3\lib\net45\System.Web.Razor.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages.Deployment, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.Deployment.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.Deployment.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.Razor.dll</HintPath>
+      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.Razor.dll</HintPath>
     </Reference>
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
@@ -82,12 +84,24 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="..\Recaptcha.Web\IRecaptchaHtmlHelper.cs">
+      <Link>IRecaptchaHtmlHelper.cs</Link>
+    </Compile>
     <Compile Include="..\Recaptcha.Web\Mvc\RecaptchaMvcExtensions.cs">
       <Link>Mvc\RecaptchaMvcExtensions.cs</Link>
     </Compile>
+    <Compile Include="..\Recaptcha.Web\Recaptcha2HtmlHelper.cs">
+      <Link>Recaptcha2HtmlHelper.cs</Link>
+    </Compile>
+    <Compile Include="..\Recaptcha.Web\Recaptcha2VerificationResult.cs">
+      <Link>Recaptcha2VerificationResult.cs</Link>
+    </Compile>
     <Compile Include="..\Recaptcha.Web\RecaptchaHtmlHelper.cs">
       <Link>RecaptchaHtmlHelper.cs</Link>
     </Compile>
+    <Compile Include="..\Recaptcha.Web\RecaptchaHtmlHelperBase.cs">
+      <Link>RecaptchaHtmlHelperBase.cs</Link>
+    </Compile>
     <Compile Include="..\Recaptcha.Web\RecaptchaKeyHelper.cs">
       <Link>RecaptchaKeyHelper.cs</Link>
     </Compile>
@@ -110,6 +124,7 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
+    <None Include="Recaptcha.pfx" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
diff --git a/src/Recaptcha.Web.4.5.1/packages.config b/src/Recaptcha.Web.4.5.1/packages.config
index 4e8927e..e9edf2e 100644
--- a/src/Recaptcha.Web.4.5.1/packages.config
+++ b/src/Recaptcha.Web.4.5.1/packages.config
@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.AspNet.Mvc" version="5.2.0" targetFramework="net451" />
-  <package id="Microsoft.AspNet.Razor" version="3.2.0" targetFramework="net451" />
-  <package id="Microsoft.AspNet.WebPages" version="3.2.0" targetFramework="net451" />
+  <package id="Microsoft.AspNet.Mvc" version="5.2.3" targetFramework="net451" />
+  <package id="Microsoft.AspNet.Razor" version="3.2.3" targetFramework="net451" />
+  <package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net451" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net451" />
+  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net451" />
 </packages>
\ No newline at end of file
diff --git a/src/Recaptcha.Web/IRecaptchaHtmlHelper.cs b/src/Recaptcha.Web/IRecaptchaHtmlHelper.cs
new file mode 100644
index 0000000..1cbafd1
--- /dev/null
+++ b/src/Recaptcha.Web/IRecaptchaHtmlHelper.cs
@@ -0,0 +1,87 @@
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Recaptcha.Web
+{
+    /// <summary>
+    /// Represents the interface for generating recaptcha HTML.
+    /// </summary>
+    public interface IRecaptchaHtmlHelper
+    {
+        #region Properties
+
+        /// <summary>
+        /// Gets or sets the ID of the HTML tag that represents recaptcha.
+        /// </summary>
+        string RecaptchaHtmlId
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets the public key of the recaptcha HTML.
+        /// </summary>
+        string PublicKey
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Determines if HTTPS intead of HTTP is to be used in reCAPTCHA API calls.
+        /// </summary>
+        SslBehavior UseSsl
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets the theme of the reCAPTCHA HTML.
+        /// </summary>
+        RecaptchaTheme Theme
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets the language of the recaptcha HTML.
+        /// </summary>
+        string Language
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets the tab index of the recaptcha HTML.
+        /// </summary>
+        int TabIndex
+        {
+            get;
+            set;
+        }
+
+        #endregion Properties
+
+        #region Methods
+
+        /// <summary>
+        /// Gets the recaptcha's HTML that needs to be rendered in an HTML page.
+        /// </summary>
+        /// <returns>Returns the HTML as an instance of the <see cref="String"/> type.</returns>
+        string ToString();
+
+        #endregion Methods
+    }
+}
diff --git a/src/Recaptcha.Web/Mvc/RecaptchaMvcExtensions.cs b/src/Recaptcha.Web/Mvc/RecaptchaMvcExtensions.cs
index bb4f975..9dc0775 100644
--- a/src/Recaptcha.Web/Mvc/RecaptchaMvcExtensions.cs
+++ b/src/Recaptcha.Web/Mvc/RecaptchaMvcExtensions.cs
@@ -21,6 +21,8 @@ namespace Recaptcha.Web.Mvc
     /// </summary>
     public static class RecaptchaMvcExtensions
     {
+        #region Public Methods
+
         /// <summary>
         /// Renders the recaptcha HTML in an MVC view. It is an extension method to the <see cref="System.Web.Mvc.HtmlHelper"/> class.
         /// </summary>
@@ -30,6 +32,7 @@ public static class RecaptchaMvcExtensions
         /// <param name="language">Sets the language of recaptcha. If no language is specified, the language of the current UI culture will be used.</param>
         /// <param name="tabIndex">Sets the tab index of recaptcha.</param>
         /// <param name="useSsl">Sets the value to the UseSsl property.</param>
+        /// <param name="apiVersion">Determines the version of the reCAPTCHA API.</param>
         /// <returns>Returns an instance of the IHtmlString type.</returns>
         public static IHtmlString Recaptcha(
             this HtmlHelper htmlHelper,
@@ -37,11 +40,23 @@ public static IHtmlString Recaptcha(
             RecaptchaTheme theme = RecaptchaTheme.Red,
             string language = null,
             int tabIndex = 0,
-            SslBehavior useSsl = SslBehavior.SameAsRequestUrl)
-        {            
-            RecaptchaHtmlHelper rHtmlHelper = new RecaptchaHtmlHelper(publicKey, theme, language, tabIndex, useSsl);
+            SslBehavior useSsl = SslBehavior.SameAsRequestUrl,
+            string apiVersion = "{recaptchaApiVersion}")
+        {
+            IRecaptchaHtmlHelper rHtmlHelper = null;
+
+            string version = RecaptchaKeyHelper.ParseKey(apiVersion);
 
-            HtmlTextWriter writer = new HtmlTextWriter(new StringWriter());
+            if (version != "2")
+            {
+                rHtmlHelper = new RecaptchaHtmlHelper(publicKey, theme, language, tabIndex, useSsl);
+            }
+            else
+            {
+                rHtmlHelper = new Recaptcha2HtmlHelper(publicKey, theme, language, tabIndex, useSsl);
+            }
+
+            var writer = new HtmlTextWriter(new StringWriter());
             writer.Write(rHtmlHelper.ToString());
 
             return htmlHelper.Raw(writer.InnerWriter.ToString());
@@ -67,5 +82,7 @@ public static RecaptchaVerificationHelper GetRecaptchaVerificationHelper(this Sy
         {
             return new RecaptchaVerificationHelper("{recaptchaPrivateKey}");
         }
+
+        #endregion Public Methods
     }
 }
\ No newline at end of file
diff --git a/src/Recaptcha.Web/Properties/AssemblyInfo.cs b/src/Recaptcha.Web/Properties/AssemblyInfo.cs
index e9086a5..c1540d4 100644
--- a/src/Recaptcha.Web/Properties/AssemblyInfo.cs
+++ b/src/Recaptcha.Web/Properties/AssemblyInfo.cs
@@ -1,4 +1,9 @@
-using System.Reflection;
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
@@ -32,5 +37,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.8.0.0")]
-[assembly: AssemblyFileVersion("1.8.0.0")]
+[assembly: AssemblyVersion("2.0.0.0")]
+[assembly: AssemblyFileVersion("2.0.0.0")]
diff --git a/src/Recaptcha.Web/Recaptcha.Web.csproj b/src/Recaptcha.Web/Recaptcha.Web.csproj
index f509ba0..bd51671 100644
--- a/src/Recaptcha.Web/Recaptcha.Web.csproj
+++ b/src/Recaptcha.Web/Recaptcha.Web.csproj
@@ -42,14 +42,16 @@
     <SignAssembly>true</SignAssembly>
   </PropertyGroup>
   <PropertyGroup>
-    <AssemblyOriginatorKeyFile>
-    </AssemblyOriginatorKeyFile>
+    <AssemblyOriginatorKeyFile>Recaptcha.pfx</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <Private>True</Private>
       <HintPath>..\packages\Microsoft.Web.Infrastructure.1.0.0.0\lib\net40\Microsoft.Web.Infrastructure.dll</HintPath>
     </Reference>
+    <Reference Include="Newtonsoft.Json">
+      <HintPath>..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Configuration" />
     <Reference Include="System.Core" />
@@ -57,27 +59,27 @@
     <Reference Include="System.Web" />
     <Reference Include="System.Web.Helpers, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.Helpers.dll</HintPath>
+      <HintPath>..\..\samples\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.Helpers.dll</HintPath>
     </Reference>
-    <Reference Include="System.Web.Mvc, Version=5.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+    <Reference Include="System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.Mvc.5.2.0\lib\net45\System.Web.Mvc.dll</HintPath>
+      <HintPath>..\..\samples\packages\Microsoft.AspNet.Mvc.5.2.3\lib\net45\System.Web.Mvc.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.Razor.3.2.0\lib\net45\System.Web.Razor.dll</HintPath>
+      <HintPath>..\..\samples\packages\Microsoft.AspNet.Razor.3.2.3\lib\net45\System.Web.Razor.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.dll</HintPath>
+      <HintPath>..\..\samples\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages.Deployment, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.Deployment.dll</HintPath>
+      <HintPath>..\..\samples\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.Deployment.dll</HintPath>
     </Reference>
     <Reference Include="System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.AspNet.WebPages.3.2.0\lib\net45\System.Web.WebPages.Razor.dll</HintPath>
+      <HintPath>..\..\samples\packages\Microsoft.AspNet.WebPages.3.2.3\lib\net45\System.Web.WebPages.Razor.dll</HintPath>
     </Reference>
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
@@ -86,8 +88,12 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="IRecaptchaHtmlHelper.cs" />
     <Compile Include="Mvc\RecaptchaMvcExtensions.cs" />
+    <Compile Include="Recaptcha2HtmlHelper.cs" />
+    <Compile Include="Recaptcha2VerificationResult.cs" />
     <Compile Include="RecaptchaHtmlHelper.cs" />
+    <Compile Include="RecaptchaHtmlHelperBase.cs" />
     <Compile Include="RecaptchaKeyHelper.cs" />
     <Compile Include="RecaptchaVerificationResult.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
@@ -98,6 +104,7 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
+    <None Include="Recaptcha.pfx" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
diff --git a/src/Recaptcha.Web/Recaptcha2HtmlHelper.cs b/src/Recaptcha.Web/Recaptcha2HtmlHelper.cs
new file mode 100644
index 0000000..568dc96
--- /dev/null
+++ b/src/Recaptcha.Web/Recaptcha2HtmlHelper.cs
@@ -0,0 +1,121 @@
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Web;
+
+namespace Recaptcha.Web
+{
+    /// <summary>
+    /// Represents the functionality to generate HTML for Recaptcha API v2.0.
+    /// </summary>
+    public class Recaptcha2HtmlHelper : RecaptchaHtmlHelperBase
+    {
+        #region Constructors
+
+        /// Creates an instance of the <see cref="Recaptcha2HtmlHelper"/> class.
+        /// </summary>
+        /// <param name="publicKey">Sets the public key to be part of the recaptcha HTML.</param>
+        public Recaptcha2HtmlHelper(string publicKey)
+            : base(publicKey)
+        { }
+
+        /// <summary>
+        /// Creates an instance of the <see cref="Recaptcha2HtmlHelper"/> class.
+        /// </summary>
+        /// <param name="publicKey">Sets the public key of the recaptcha HTML.</param>
+        /// <param name="theme">Sets the theme of the recaptcha HTML.</param>
+        /// <param name="language">Sets the language of the recaptcha HTML.</param>
+        /// <param name="tabIndex">Sets the tab index of the recaptcha HTML.</param>   
+        public Recaptcha2HtmlHelper(string publicKey, RecaptchaTheme theme, string language, int tabIndex)
+            : base(publicKey, theme, language, tabIndex)
+        { }
+
+        /// <summary>
+        /// Creates an instance of the <see cref="Recaptcha2HtmlHelper"/> class.
+        /// </summary>
+        /// <param name="publicKey">Sets the public key of the recaptcha HTML.</param>
+        /// <param name="theme">Sets the theme of the recaptcha HTML.</param>
+        /// <param name="language">Sets the language of the recaptcha HTML.</param>
+        /// <param name="tabIndex">Sets the tab index of the recaptcha HTML.</param>    
+        /// <param name="useSsl">Determines whether to use SSL in reCAPTCHA API URLs.</param>
+        public Recaptcha2HtmlHelper(string publicKey, RecaptchaTheme theme, string language, int tabIndex, SslBehavior useSsl)
+            : base(publicKey, theme, language, tabIndex, useSsl)
+        { }
+
+        #endregion Constructors
+
+        #region Public Methods
+
+        /// <summary>
+        /// Gets the recaptcha's HTML that needs to be rendered in an HTML page.
+        /// </summary>
+        /// <returns>Returns the HTML as an instance of the <see cref="String"/> type.</returns>
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+
+            string lang = "";
+
+            if (!String.IsNullOrEmpty(Language))
+            {
+                lang = string.Format("?hl={0}", Language);
+            }
+
+            bool doUseSsl = false;
+
+            if (UseSsl == SslBehavior.DoNotUseSsl)
+            {
+                doUseSsl = false;
+            }
+            else if (UseSsl == SslBehavior.AlwaysUseSsl)
+            {
+                doUseSsl = true;
+            }
+            else if (UseSsl == SslBehavior.SameAsRequestUrl)
+            {
+                doUseSsl = HttpContext.Current.Request.IsSecureConnection;
+            }
+
+            var protocol = "https://";
+
+            if (!doUseSsl)
+            {
+                protocol = "http://";
+            }
+
+            sb.Append(string.Format("<script src=\"{0}www.google.com/recaptcha/api.js{1}\" async defer></script>", protocol, lang));
+            sb.Append(string.Format("<div class=\"g-recaptcha\" data-sitekey=\"{0}\"", PublicKey));
+
+            if (Theme != RecaptchaTheme.Default)
+            {
+                var theme = "light";
+
+                if (Theme == RecaptchaTheme.Dark)
+                {
+                    theme = "dark";
+                }
+
+                sb.Append(string.Format(" data-theme=\"{0}\"", theme));
+            }
+
+            if(TabIndex != 0)
+            {
+                sb.Append(string.Format(" data-tabindex=\"{0}\"", TabIndex));
+            }
+
+            sb.Append("></div>");
+
+            return sb.ToString();
+        }
+
+        #endregion Public Methods
+    }
+}
diff --git a/src/Recaptcha.Web/Recaptcha2VerificationResult.cs b/src/Recaptcha.Web/Recaptcha2VerificationResult.cs
new file mode 100644
index 0000000..aafdd32
--- /dev/null
+++ b/src/Recaptcha.Web/Recaptcha2VerificationResult.cs
@@ -0,0 +1,44 @@
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Recaptcha.Web
+{
+    /// <summary>
+    /// Represents the JSON result for reCAPTCHA v2.
+    /// </summary>
+    public class Recaptcha2VerificationResult
+    {
+        #region Properties
+
+        /// <summary>
+        /// Determines if the reCAPTCHA verification was successful.
+        /// </summary>
+        [JsonProperty("success")]
+        public bool Success
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Represents an array of errors if reCAPTCHA verification was not successful.
+        /// </summary>
+        [JsonProperty("error-codes")]
+        public string[] ErrorCodes
+        {
+            get;
+            set;
+        }
+
+        #endregion Properties
+    }
+}
diff --git a/src/Recaptcha.Web/RecaptchaHtmlHelper.cs b/src/Recaptcha.Web/RecaptchaHtmlHelper.cs
index 76d6331..b48909c 100644
--- a/src/Recaptcha.Web/RecaptchaHtmlHelper.cs
+++ b/src/Recaptcha.Web/RecaptchaHtmlHelper.cs
@@ -16,21 +16,16 @@ namespace Recaptcha.Web
     /// <summary>
     /// Represents the functionality to generate recaptcha HTML.
     /// </summary>
-    public class RecaptchaHtmlHelper
+    public class RecaptchaHtmlHelper : RecaptchaHtmlHelperBase
     {
-        /// <summary>
+        #region Constructors
+
         /// Creates an instance of the <see cref="RecaptchaHtmlHelper"/> class.
         /// </summary>
         /// <param name="publicKey">Sets the public key to be part of the recaptcha HTML.</param>
         public RecaptchaHtmlHelper(string publicKey)
-        {
-            if (String.IsNullOrEmpty(publicKey))
-            {
-                throw new InvalidOperationException("Public key cannot be null or empty.");
-            }
-
-            this.PublicKey = RecaptchaKeyHelper.ParseKey(publicKey);
-        }
+            : base(publicKey)
+        { }
 
         /// <summary>
         /// Creates an instance of the <see cref="RecaptchaHtmlHelper"/> class.
@@ -38,20 +33,10 @@ public RecaptchaHtmlHelper(string publicKey)
         /// <param name="publicKey">Sets the public key of the recaptcha HTML.</param>
         /// <param name="theme">Sets the theme of the recaptcha HTML.</param>
         /// <param name="language">Sets the language of the recaptcha HTML.</param>
-        /// <param name="tabIndex">Sets the tab index of the recaptcha HTML.</param>    
+        /// <param name="tabIndex">Sets the tab index of the recaptcha HTML.</param>   
         public RecaptchaHtmlHelper(string publicKey, RecaptchaTheme theme, string language, int tabIndex)
-        {
-            this.PublicKey = RecaptchaKeyHelper.ParseKey(publicKey);
-
-            if (String.IsNullOrEmpty(this.PublicKey))
-            {
-                throw new InvalidOperationException("Public key cannot be null or empty.");
-            }
-
-            this.Theme = theme;
-            this.Language = language;
-            this.TabIndex = tabIndex;
-        }
+            : base(publicKey, theme, language, tabIndex)
+        { }
 
         /// <summary>
         /// Creates an instance of the <see cref="RecaptchaHtmlHelper"/> class.
@@ -62,65 +47,12 @@ public RecaptchaHtmlHelper(string publicKey, RecaptchaTheme theme, string langua
         /// <param name="tabIndex">Sets the tab index of the recaptcha HTML.</param>    
         /// <param name="useSsl">Determines whether to use SSL in reCAPTCHA API URLs.</param>
         public RecaptchaHtmlHelper(string publicKey, RecaptchaTheme theme, string language, int tabIndex, SslBehavior useSsl)
-        {
-            this.PublicKey = RecaptchaKeyHelper.ParseKey(publicKey);
-
-            if (String.IsNullOrEmpty(this.PublicKey))
-            {
-                throw new InvalidOperationException("Public key cannot be null or empty.");
-            }
+            : base(publicKey, theme, language, tabIndex, useSsl)
+        { }
 
-            this.Theme = theme;
-            this.Language = language;
-            this.TabIndex = tabIndex;
+        #endregion Constructors
 
-            UseSsl = useSsl;
-        }
-
-        /// <summary>
-        /// Gets the public key of the recaptcha HTML.
-        /// </summary>
-        public string PublicKey
-        {
-            get;
-            private set;
-        }
-
-        /// <summary>
-        /// Determines if HTTPS intead of HTTP is to be used in reCAPTCHA API calls.
-        /// </summary>
-        public SslBehavior UseSsl
-        {
-            get;
-            private set;
-        }
-
-        /// <summary>
-        /// Gets or sets the theme of the reCAPTCHA HTML.
-        /// </summary>
-        public RecaptchaTheme Theme
-        {
-            get;
-            set;
-        }
-
-        /// <summary>
-        /// Gets or sets the language of the recaptcha HTML.
-        /// </summary>
-        public string Language
-        {
-            get;
-            set;
-        }
-
-        /// <summary>
-        /// Gets or sets the tab index of the recaptcha HTML.
-        /// </summary>
-        public int TabIndex
-        {
-            get;
-            set;
-        }      
+        #region Public Methods
 
         /// <summary>
         /// Gets the recaptcha's HTML that needs to be rendered in an HTML page.
@@ -157,18 +89,19 @@ public override string ToString()
                 doUseSsl = HttpContext.Current.Request.IsSecureConnection;
             }
 
+            var protocol = "https://";
+
             if (!doUseSsl)
             {
-                sb.Append(String.Format("<script type=\"text/javascript\" src=\"http://www.google.com/recaptcha/api/challenge?k={0}&lang={1}\">", PublicKey, Language));
-            }
-            else
-            {
-                sb.Append(String.Format("<script type=\"text/javascript\" src=\"https://www.google.com/recaptcha/api/challenge?k={0}&lang={1}\">", PublicKey, Language));
+                protocol = "http://";
             }
 
+            sb.Append(String.Format("<script type=\"text/javascript\" src=\"{0}www.google.com/recaptcha/api/challenge?k={1}&lang={2}\">", protocol, PublicKey, Language));
             sb.Append("</script>");
 
             return sb.ToString();
         }
+
+        #endregion Public Methods
     }
 }
diff --git a/src/Recaptcha.Web/RecaptchaHtmlHelperBase.cs b/src/Recaptcha.Web/RecaptchaHtmlHelperBase.cs
new file mode 100644
index 0000000..41f5cdb
--- /dev/null
+++ b/src/Recaptcha.Web/RecaptchaHtmlHelperBase.cs
@@ -0,0 +1,135 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Recaptcha.Web
+{
+    /// <summary>
+    /// Represents the base functionality for a reCAPTCHA HTML helper class.
+    /// </summary>
+    public abstract class RecaptchaHtmlHelperBase : IRecaptchaHtmlHelper
+    {
+        #region Constructors
+
+        /// <summary>
+        /// Creates an instance of the <see cref="RecaptchaHtmlHelperBase"/> class.
+        /// </summary>
+        /// <param name="publicKey">Sets the public key to be part of the recaptcha HTML.</param>
+        public RecaptchaHtmlHelperBase(string publicKey)
+        {
+            if (String.IsNullOrEmpty(publicKey))
+            {
+                throw new InvalidOperationException("Public key cannot be null or empty.");
+            }
+
+            this.PublicKey = RecaptchaKeyHelper.ParseKey(publicKey);
+        }
+
+        /// <summary>
+        /// Creates an instance of the <see cref="RecaptchaHtmlHelperBase"/> class.
+        /// </summary>
+        /// <param name="publicKey">Sets the public key of the recaptcha HTML.</param>
+        /// <param name="theme">Sets the theme of the recaptcha HTML.</param>
+        /// <param name="language">Sets the language of the recaptcha HTML.</param>
+        /// <param name="tabIndex">Sets the tab index of the recaptcha HTML.</param>    
+        public RecaptchaHtmlHelperBase(string publicKey, RecaptchaTheme theme, string language, int tabIndex)
+        {
+            this.PublicKey = RecaptchaKeyHelper.ParseKey(publicKey);
+
+            if (String.IsNullOrEmpty(this.PublicKey))
+            {
+                throw new InvalidOperationException("Public key cannot be null or empty.");
+            }
+
+            this.Theme = theme;
+            this.Language = language;
+            this.TabIndex = tabIndex;
+        }
+
+        /// <summary>
+        /// Creates an instance of the <see cref="RecaptchaHtmlHelperBase"/> class.
+        /// </summary>
+        /// <param name="publicKey">Sets the public key of the recaptcha HTML.</param>
+        /// <param name="theme">Sets the theme of the recaptcha HTML.</param>
+        /// <param name="language">Sets the language of the recaptcha HTML.</param>
+        /// <param name="tabIndex">Sets the tab index of the recaptcha HTML.</param>    
+        /// <param name="useSsl">Determines whether to use SSL in reCAPTCHA API URLs.</param>
+        public RecaptchaHtmlHelperBase(string publicKey, RecaptchaTheme theme, string language, int tabIndex, SslBehavior useSsl)
+        {
+            this.PublicKey = RecaptchaKeyHelper.ParseKey(publicKey);
+
+            if (String.IsNullOrEmpty(this.PublicKey))
+            {
+                throw new InvalidOperationException("Public key cannot be null or empty.");
+            }
+
+            this.Theme = theme;
+            this.Language = language;
+            this.TabIndex = tabIndex;
+
+            UseSsl = useSsl;
+        }
+
+        #endregion Constructors
+
+        #region Properties
+
+        /// <summary>
+        /// Gets or sets the ID of the HTML tag that represents recaptcha.
+        /// </summary>
+        public string RecaptchaHtmlId
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets the public key of the recaptcha HTML.
+        /// </summary>
+        public string PublicKey
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Determines if HTTPS intead of HTTP is to be used in reCAPTCHA API calls.
+        /// </summary>
+        public SslBehavior UseSsl
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets the theme of the reCAPTCHA HTML.
+        /// </summary>
+        public RecaptchaTheme Theme
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets the language of the recaptcha HTML.
+        /// </summary>
+        public string Language
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets the tab index of the recaptcha HTML.
+        /// </summary>
+        public int TabIndex
+        {
+            get;
+            set;
+        }
+
+        #endregion Properties
+    }
+}
diff --git a/src/Recaptcha.Web/RecaptchaTheme.cs b/src/Recaptcha.Web/RecaptchaTheme.cs
index 5967d9f..a1f5ddb 100644
--- a/src/Recaptcha.Web/RecaptchaTheme.cs
+++ b/src/Recaptcha.Web/RecaptchaTheme.cs
@@ -16,21 +16,41 @@ namespace Recaptcha.Web
     /// </summary>
     public enum RecaptchaTheme
     {
+        #region Common value for reCAPTCHA v1 and v2.
         /// <summary>
-        /// Red theme of the control.
+        /// Default theme. No theme will be specified in the rendered HTML / JavaScript of the reCAPTCHA control.
         /// </summary>
-        Red = 0,
+        Default = 0,
+        #endregion Common values for reCAPTCHA v1 and v2.
+
+        #region Values for reCAPTCHA v1
+        /// <summary>
+        /// Red theme. Applicable for reCAPTCHA v1.
+        /// </summary>
+        Red = 1,
+        /// <summary>
+        /// Blackglass theme. Applicable for reCAPTCHA v1.
+        /// </summary>
+        Blackglass = 2,
+        /// <summary>
+        /// White theme. Applicable for reCAPTCHA v1.
+        /// </summary>
+        White = 3,
         /// <summary>
-        /// Blackglass theme of the control.
+        /// Clean theme. Applicable for reCAPTCHA v1.
         /// </summary>
-        Blackglass = 1,
+        Clean = 4,
+        #endregion Values for reCAPTCHA v1
+
+        #region Values for reCAPTCHA v2
         /// <summary>
-        /// White theme of the control.
+        /// Light theme. Applicable for reCAPTCHA v2.
         /// </summary>
-        White = 2,
+        Light = 50,
         /// <summary>
-        /// Clean theme of the control.
+        /// Dark theme. Applicable for reCAPTCHA v2.
         /// </summary>
-        Clean = 3
+        Dark = 51
+        #endregion Values for reCAPTCHA v2
     }
 }
diff --git a/src/Recaptcha.Web/RecaptchaVerificationHelper.cs b/src/Recaptcha.Web/RecaptchaVerificationHelper.cs
index 1522ff4..2ab3ae6 100644
--- a/src/Recaptcha.Web/RecaptchaVerificationHelper.cs
+++ b/src/Recaptcha.Web/RecaptchaVerificationHelper.cs
@@ -10,6 +10,7 @@
 using System.Net;
 using System.IO;
 using System.Threading.Tasks;
+using Newtonsoft.Json;
 
 namespace Recaptcha.Web
 {
@@ -18,7 +19,14 @@ namespace Recaptcha.Web
     /// </summary>
     public class RecaptchaVerificationHelper
     {
-        private string _Challenge = null;
+        #region Fields
+
+        private string _challenge = null;
+        private bool _isVersion2 = false;
+
+        #endregion Fields
+
+        #region Constructors
 
         private RecaptchaVerificationHelper()
         { }
@@ -46,18 +54,31 @@ internal RecaptchaVerificationHelper(string privateKey)
             this.PrivateKey = privateKey;
             this.UserHostAddress = request.UserHostAddress;
 
-            if (!string.IsNullOrEmpty(request.Form["recaptcha_challenge_field"]))
+            //Check if its version 2
+            if (request.Form.AllKeys.Contains("g-recaptcha-response"))
             {
-                this._Challenge = request.Form["recaptcha_challenge_field"];
-                this.Response = request.Form["recaptcha_response_field"];
+                Response = request.Form["g-recaptcha-response"];
+                _isVersion2 = true;
             }
             else
             {
-                this._Challenge = request.Params["recaptcha_challenge_field"];
-                this.Response = request.Params["recaptcha_response_field"];
+                if (!string.IsNullOrEmpty(request.Form["recaptcha_challenge_field"]))
+                {
+                    this._challenge = request.Form["recaptcha_challenge_field"];
+                    this.Response = request.Form["recaptcha_response_field"];
+                }
+                else
+                {
+                    this._challenge = request.Params["recaptcha_challenge_field"];
+                    this.Response = request.Params["recaptcha_response_field"];
+                }
             }
         }
 
+        #endregion Constructors
+
+        #region Properties
+
         /// <summary>
         /// Determines if HTTPS intead of HTTP is to be used in Recaptcha verification API calls.
         /// </summary>
@@ -94,17 +115,16 @@ public string Response
             private set;
         }
 
+        #endregion Properties
+
+        #region Public Methods
+
         /// <summary>
         /// Verifies whether the user's response to the recaptcha request is correct.
         /// </summary>
         /// <returns>Returns the result as a value of the <see cref="RecaptchaVerificationResult"/> enum.</returns>
         public RecaptchaVerificationResult VerifyRecaptchaResponse()
         {
-            if(string.IsNullOrEmpty(_Challenge))
-            {
-                return RecaptchaVerificationResult.ChallengeNotProvided;
-            }
-
             if(string.IsNullOrEmpty(Response))
             {
                 return RecaptchaVerificationResult.NullOrEmptyCaptchaSolution;
@@ -112,7 +132,17 @@ public RecaptchaVerificationResult VerifyRecaptchaResponse()
 
             string privateKey = RecaptchaKeyHelper.ParseKey(PrivateKey);
 
-            string postData = String.Format("privatekey={0}&remoteip={1}&challenge={2}&response={3}", privateKey, this.UserHostAddress, this._Challenge, this.Response);
+            if(_isVersion2)
+            {
+                return VerifyRecpatcha2Response(privateKey);
+            }
+
+            if (string.IsNullOrEmpty(_challenge))
+            {
+                return RecaptchaVerificationResult.ChallengeNotProvided;
+            }
+
+            string postData = String.Format("privatekey={0}&remoteip={1}&challenge={2}&response={3}", privateKey, this.UserHostAddress, this._challenge, this.Response);
 
             byte[] postDataBuffer = System.Text.Encoding.ASCII.GetBytes(postData);
 
@@ -152,32 +182,7 @@ public RecaptchaVerificationResult VerifyRecaptchaResponse()
                     responseTokens = sr.ReadToEnd().Split('\n');
                 }
 
-                if (responseTokens.Length == 2)
-                {
-                    Boolean success = responseTokens[0].Equals("true", StringComparison.CurrentCulture);
-
-                    if (success)
-                    {
-                        return RecaptchaVerificationResult.Success;
-                    }
-                    else
-                    {
-                        if (responseTokens[1].Equals("incorrect-captcha-sol", StringComparison.CurrentCulture))
-                        {
-                            return RecaptchaVerificationResult.IncorrectCaptchaSolution;
-                        }
-                        else if (responseTokens[1].Equals("invalid-site-private-key", StringComparison.CurrentCulture))
-                        {
-                            return RecaptchaVerificationResult.InvalidPrivateKey;
-                        }
-                        else if (responseTokens[1].Equals("invalid-request-cookie", StringComparison.CurrentCulture))
-                        {
-                            return RecaptchaVerificationResult.InvalidCookieParameters;
-                        }
-                    }
-                }
-
-                return RecaptchaVerificationResult.UnknownError;
+                return ToRecaptchaVerificationResult(responseTokens);
             }
             catch (Exception ex)
             {
@@ -191,7 +196,7 @@ public RecaptchaVerificationResult VerifyRecaptchaResponse()
         /// <returns>Returns the result as a value of the <see cref="RecaptchaVerificationResult"/> enum.</returns>
         public Task<RecaptchaVerificationResult> VerifyRecaptchaResponseTaskAsync()
         {
-            if (string.IsNullOrEmpty(_Challenge))
+            if (string.IsNullOrEmpty(_challenge))
             {
                 return FromTaskResult<RecaptchaVerificationResult>(RecaptchaVerificationResult.ChallengeNotProvided);
             }
@@ -205,7 +210,7 @@ public Task<RecaptchaVerificationResult> VerifyRecaptchaResponseTaskAsync()
             {
                 string privateKey = RecaptchaKeyHelper.ParseKey(PrivateKey);
 
-                string postData = String.Format("privatekey={0}&remoteip={1}&challenge={2}&response={3}", privateKey, this.UserHostAddress, this._Challenge, this.Response);
+                string postData = String.Format("privatekey={0}&remoteip={1}&challenge={2}&response={3}", privateKey, this.UserHostAddress, this._challenge, this.Response);
 
                 byte[] postDataBuffer = System.Text.Encoding.ASCII.GetBytes(postData);
 
@@ -243,32 +248,61 @@ public Task<RecaptchaVerificationResult> VerifyRecaptchaResponseTaskAsync()
                         responseTokens = sr.ReadToEnd().Split('\n');
                     }
 
-                    if (responseTokens.Length == 2)
+                    return ToRecaptchaVerificationResult(responseTokens);
+                }
+                catch (Exception ex)
+                {
+                    throw ex;
+                }
+            });
+
+            return result;
+        }
+
+        #endregion Public Methods
+
+        #region Private Methods
+
+        private Task<RecaptchaVerificationResult> VerifyRecpatcha2ResponseTaskAsync(string privateKey)
+        {
+            Task<RecaptchaVerificationResult> taskResult = Task<RecaptchaVerificationResult>.Factory.StartNew(() =>
+            {
+                string postData = String.Format("secret={0}&response={1}&remoteip={2}", privateKey, this.Response, this.UserHostAddress);
+
+                byte[] postDataBuffer = System.Text.Encoding.ASCII.GetBytes(postData);
+
+                Uri verifyUri = null;
+
+                verifyUri = new Uri("https://www.google.com/recaptcha/api/siteverify", UriKind.Absolute);
+
+                try
+                {
+                    var webRequest = (HttpWebRequest)WebRequest.Create(verifyUri);
+                    webRequest.ContentType = "application/x-www-form-urlencoded";
+                    webRequest.ContentLength = postDataBuffer.Length;
+                    webRequest.Method = "POST";
+
+                    var proxy = WebRequest.GetSystemWebProxy();
+                    proxy.Credentials = CredentialCache.DefaultCredentials;
+
+                    webRequest.Proxy = proxy;
+
+                    using (var requestStream = webRequest.GetRequestStream())
+                    {
+                        requestStream.Write(postDataBuffer, 0, postDataBuffer.Length);
+                    }
+
+                    var webResponse = (HttpWebResponse)webRequest.GetResponse();
+
+                    string sResponse = null;
+
+                    using (var sr = new StreamReader(webResponse.GetResponseStream()))
                     {
-                        Boolean success = responseTokens[0].Equals("true", StringComparison.CurrentCulture);
-
-                        if (success)
-                        {
-                            return RecaptchaVerificationResult.Success;
-                        }
-                        else
-                        {
-                            if (responseTokens[1].Equals("incorrect-captcha-sol", StringComparison.CurrentCulture))
-                            {
-                                return RecaptchaVerificationResult.IncorrectCaptchaSolution;
-                            }
-                            else if (responseTokens[1].Equals("invalid-site-private-key", StringComparison.CurrentCulture))
-                            {
-                                return RecaptchaVerificationResult.InvalidPrivateKey;
-                            }
-                            else if (responseTokens[1].Equals("invalid-request-cookie", StringComparison.CurrentCulture))
-                            {
-                                return RecaptchaVerificationResult.InvalidCookieParameters;
-                            }
-                        }
+                        sResponse = sr.ReadToEnd();
                     }
 
-                    return RecaptchaVerificationResult.UnknownError;
+                    var result = JsonConvert.DeserializeObject<Recaptcha2VerificationResult>(sResponse);
+                    return ToRecaptchaVerificationResult(result);
                 }
                 catch (Exception ex)
                 {
@@ -276,7 +310,104 @@ public Task<RecaptchaVerificationResult> VerifyRecaptchaResponseTaskAsync()
                 }
             });
 
-            return result;
+            return taskResult;
+        }
+
+        private RecaptchaVerificationResult VerifyRecpatcha2Response(string privateKey)
+        {
+            string postData = String.Format("secret={0}&response={1}&remoteip={2}", privateKey, this.Response, this.UserHostAddress);
+
+            byte[] postDataBuffer = System.Text.Encoding.ASCII.GetBytes(postData);
+
+            Uri verifyUri = null;
+
+            verifyUri = new Uri("https://www.google.com/recaptcha/api/siteverify", UriKind.Absolute);
+
+            try
+            {
+                var webRequest = (HttpWebRequest)WebRequest.Create(verifyUri);
+                webRequest.ContentType = "application/x-www-form-urlencoded";
+                webRequest.ContentLength = postDataBuffer.Length;
+                webRequest.Method = "POST";
+
+                var proxy = WebRequest.GetSystemWebProxy();
+                proxy.Credentials = CredentialCache.DefaultCredentials;
+
+                webRequest.Proxy = proxy;
+
+                using (var requestStream = webRequest.GetRequestStream())
+                {
+                    requestStream.Write(postDataBuffer, 0, postDataBuffer.Length);
+                }
+
+                var webResponse = (HttpWebResponse)webRequest.GetResponse();
+
+                string sResponse = null;
+
+                using (var sr = new StreamReader(webResponse.GetResponseStream()))
+                {
+                    sResponse = sr.ReadToEnd();
+                }
+
+                var result = JsonConvert.DeserializeObject<Recaptcha2VerificationResult>(sResponse);
+                return ToRecaptchaVerificationResult(result);
+            }
+            catch (Exception ex)
+            {
+                throw ex;
+            }
+        }
+
+        private RecaptchaVerificationResult ToRecaptchaVerificationResult(string[] result)
+        {
+            if (result.Length == 2)
+            {
+                Boolean success = result[0].Equals("true", StringComparison.CurrentCulture);
+
+                if (success)
+                {
+                    return RecaptchaVerificationResult.Success;
+                }
+                else
+                {
+                    if (result[1].Equals("incorrect-captcha-sol", StringComparison.CurrentCulture))
+                    {
+                        return RecaptchaVerificationResult.IncorrectCaptchaSolution;
+                    }
+                    else if (result[1].Equals("invalid-site-private-key", StringComparison.CurrentCulture))
+                    {
+                        return RecaptchaVerificationResult.InvalidPrivateKey;
+                    }
+                    else if (result[1].Equals("invalid-request-cookie", StringComparison.CurrentCulture))
+                    {
+                        return RecaptchaVerificationResult.InvalidCookieParameters;
+                    }
+                }
+            }
+
+            return RecaptchaVerificationResult.UnknownError;
+        }
+
+        private RecaptchaVerificationResult ToRecaptchaVerificationResult(Recaptcha2VerificationResult result)
+        {
+            if(result.Success)
+            {
+                return RecaptchaVerificationResult.Success;
+            }
+
+            switch (result.ErrorCodes[0])
+            {
+                case "missing-input-secret":
+                    return RecaptchaVerificationResult.InvalidPrivateKey;
+                case "invalid-input-secret":
+                    return RecaptchaVerificationResult.InvalidPrivateKey;
+                case "missing-input-response":
+                    return RecaptchaVerificationResult.NullOrEmptyCaptchaSolution;
+                case "invalid-input-response":
+                    return RecaptchaVerificationResult.IncorrectCaptchaSolution;
+            }
+
+            return RecaptchaVerificationResult.UnknownError;
         }
 
         // Added this method to support backward compatibility with
@@ -288,5 +419,7 @@ private Task<TValue> FromTaskResult<TValue>(TValue value)
             tcs.SetResult(value);
             return tcs.Task;
         }
+
+        #endregion Private Methods
     }
 }
\ No newline at end of file
diff --git a/src/Recaptcha.Web/RecaptchaVerificationResult.cs b/src/Recaptcha.Web/RecaptchaVerificationResult.cs
index 46d85af..1f10bff 100644
--- a/src/Recaptcha.Web/RecaptchaVerificationResult.cs
+++ b/src/Recaptcha.Web/RecaptchaVerificationResult.cs
@@ -16,12 +16,14 @@ namespace Recaptcha.Web
     /// </summary>
     public enum RecaptchaVerificationResult
     {
+        #region Common values for v1 and v2
+
         /// <summary>
         /// Verification failed but the exact reason is not known.
         /// </summary>
         UnknownError = 0,
         /// <summary>
-        /// Verification succeeded.
+        /// Verification succeeded with no errors.
         /// </summary>
         Success = 1,
         /// <summary>
@@ -29,11 +31,7 @@ public enum RecaptchaVerificationResult
         /// </summary>
         IncorrectCaptchaSolution = 2,
         /// <summary>
-        /// The request parameters in the client-side cookie are invalid.
-        /// </summary>
-        InvalidCookieParameters = 3,
-        /// <summary>
-        /// The private supplied at the time of verification process is invalid.
+        /// The private supplied at the time of verification process is invalid. Private key is also known as secret key in reCAPTCHA v2.
         /// </summary>
         InvalidPrivateKey = 4,
         /// <summary>
@@ -41,8 +39,23 @@ public enum RecaptchaVerificationResult
         /// </summary>
         NullOrEmptyCaptchaSolution = 5,
         /// <summary>
+        /// The private key is missing. Private key is also known as secret key in reCAPTCHA v2.
+        /// </summary>
+        NullOrEmptyPrivateKey = 7,
+
+        #endregion Common values for v1 and v2
+
+        #region Values for reCAPTCHA v1
+
+        /// <summary>
+        /// The request parameters in the client-side cookie are invalid.
+        /// </summary>
+        InvalidCookieParameters = 3,
+        /// <summary>
         /// The recaptcha challenge could not be retrieved.
         /// </summary>
         ChallengeNotProvided = 6
+
+        #endregion Values for reCAPTCHA v1
     }
 }
diff --git a/src/Recaptcha.Web/SslBehavior.cs b/src/Recaptcha.Web/SslBehavior.cs
index 30d6d80..db85a15 100644
--- a/src/Recaptcha.Web/SslBehavior.cs
+++ b/src/Recaptcha.Web/SslBehavior.cs
@@ -1,4 +1,9 @@
-using System;
+/* ============================================================================================================================
+ * THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
+ * LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * =========================================================================================================================== */
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
diff --git a/src/Recaptcha.Web/UI/Controls/Recaptcha.cs b/src/Recaptcha.Web/UI/Controls/Recaptcha.cs
index 218c4cd..2782e1d 100644
--- a/src/Recaptcha.Web/UI/Controls/Recaptcha.cs
+++ b/src/Recaptcha.Web/UI/Controls/Recaptcha.cs
@@ -23,7 +23,35 @@ namespace Recaptcha.Web.UI.Controls
     [ToolboxData("<{0}:Recaptcha runat=server></{0}:Recaptcha>")]
     public class Recaptcha : WebControl
     {
-        private RecaptchaVerificationHelper _VerificationHelper = null;
+        #region Fields
+
+        private RecaptchaVerificationHelper _verificationHelper = null;
+
+        #endregion Fields
+
+        #region Properties
+
+        /// <summary>
+        /// Gets or sets the API version of the recaptcha control.
+        /// </summary>
+        /// <remarks>The value of the <see cref="ApiVersion"/> property is optional. If the value is not set, version 1 is automatically assumed.</remarks>
+        [Bindable(true)]
+        [Category("Behavior")]
+        [DefaultValue("{recaptchaApiVersion}")]
+        [Localizable(false)]
+        public string ApiVersion
+        {
+            get
+            {
+                String s = (String)ViewState["ApiVersion"];
+                return ((s == null) ? "{recaptchaApiVersion}" : s);
+            }
+
+            set
+            {
+                ViewState["ApiVersion"] = value;
+            }
+        }
 
         /// <summary>
         /// Gets or sets the public key of the recaptcha control.
@@ -145,15 +173,19 @@ public string Response
         {
             get
             {
-                if (_VerificationHelper != null)
+                if (_verificationHelper != null)
                 {
-                    return _VerificationHelper.Response;
+                    return _verificationHelper.Response;
                 }
 
                 return String.Empty;
             }
         }
 
+        #endregion Properties
+
+        #region Control Events
+
         /// <summary>
         /// Calls the OnLoad method of the parent class <see cref="System.Web.UI.WebControls.WebControl"/> and initializes the internal state of the <see cref="Recaptcha"/> control for verification of the user's response to the recaptcha challenge.
         /// </summary>
@@ -164,7 +196,7 @@ protected override void OnLoad(EventArgs e)
 
             if (this.Page.IsPostBack)
             {
-                _VerificationHelper = new RecaptchaVerificationHelper(this.PrivateKey);
+                _verificationHelper = new RecaptchaVerificationHelper(this.PrivateKey);
             }
         }
 
@@ -181,11 +213,27 @@ protected override void RenderContents(HtmlTextWriter output)
             }
             else
             {
-                RecaptchaHtmlHelper htmlHelper = new RecaptchaHtmlHelper(this.PublicKey, this.Theme, this.Language, this.TabIndex, this.UseSsl);
+                IRecaptchaHtmlHelper htmlHelper = null;
+
+                string apiVersion = RecaptchaKeyHelper.ParseKey(ApiVersion);
+
+                if (apiVersion != "2")
+                {
+                    htmlHelper = new RecaptchaHtmlHelper(this.PublicKey, this.Theme, this.Language, this.TabIndex, this.UseSsl);
+                }
+                else
+                {
+                    htmlHelper = new Recaptcha2HtmlHelper(this.PublicKey, this.Theme, this.Language, this.TabIndex, this.UseSsl);
+                }
+                
                 output.Write(htmlHelper.ToString());
             }
         }
 
+        #endregion Control Events
+
+        #region Public Methods
+
         /// <summary>
         /// Verifies the user's answer to the recaptcha challenge.
         /// </summary>
@@ -194,12 +242,12 @@ protected override void RenderContents(HtmlTextWriter output)
         ///<exception cref="System.Net.WebException">The time-out period for the recaptcha verification request expired.</exception>
         public RecaptchaVerificationResult Verify()
         {
-            if (_VerificationHelper == null)
+            if (_verificationHelper == null)
             {
-                _VerificationHelper = new RecaptchaVerificationHelper(this.PrivateKey);
+                _verificationHelper = new RecaptchaVerificationHelper(this.PrivateKey);
             }
 
-            return _VerificationHelper.VerifyRecaptchaResponse();
+            return _verificationHelper.VerifyRecaptchaResponse();
         }
 
         /// <summary>
@@ -210,12 +258,14 @@ public RecaptchaVerificationResult Verify()
         ///<exception cref="System.Net.WebException">The time-out period for the recaptcha verification request expired.</exception>
         public Task<RecaptchaVerificationResult> VerifyTaskAsync()
         {
-            if (_VerificationHelper == null)
+            if (_verificationHelper == null)
             {
-                _VerificationHelper = new RecaptchaVerificationHelper(this.PrivateKey);
+                _verificationHelper = new RecaptchaVerificationHelper(this.PrivateKey);
             }
 
-            return _VerificationHelper.VerifyRecaptchaResponseTaskAsync();
+            return _verificationHelper.VerifyRecaptchaResponseTaskAsync();
         }
+
+        #endregion Public Methods
     }
 }
diff --git a/src/Recaptcha.Web/packages.config b/src/Recaptcha.Web/packages.config
index c5cad21..5ea0358 100644
--- a/src/Recaptcha.Web/packages.config
+++ b/src/Recaptcha.Web/packages.config
@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.AspNet.Mvc" version="5.2.0" targetFramework="net45" />
-  <package id="Microsoft.AspNet.Razor" version="3.2.0" targetFramework="net45" />
-  <package id="Microsoft.AspNet.WebPages" version="3.2.0" targetFramework="net45" />
+  <package id="Microsoft.AspNet.Mvc" version="5.2.3" targetFramework="net45" />
+  <package id="Microsoft.AspNet.Razor" version="3.2.3" targetFramework="net45" />
+  <package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net45" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
 </packages>
\ No newline at end of file