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Validate Recaptcha

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Net; using System.IO; using System.Web.Mvc; namespace WeBlog.Core {   public static class RecaptchaUtils {     public static JsonResult ValidateRecaptcha( string privateKey, string remoteip, string challenge, string response) {       string postData = String.Format("privatekey={0}&remoteip={1}&challenge={2}&response={3}",                             privateKey, remoteip,                             challenge, response);       JsonResult result = new JsonResult();       byte[] postDataBuffer = System.Text.Encoding.ASCII.GetBytes(postData);       Uri serviceUri = new Uri("http://api-verify.recaptcha.net/verify", UriKind.Absolute);       try {         HttpWebRequest webRequest = (HttpWebRequest)System.Net.WebRequest.Create(serviceUri);         webRequest.ContentType = "application/x-www-form-urlencoded";         webRequest.ContentLength = postDataBuffer.Length;         webRequest.Method = "POST";                  //incase you are using a proxy server         IWebProxy proxy = WebRequest.GetSystemWebProxy();         proxy.Credentials = System.Net.CredentialCache.DefaultCredentials;         webRequest.Proxy = proxy;         Stream requestStream = webRequest.GetRequestStream();         requestStream.Write(postDataBuffer, 0, postDataBuffer.Length);         HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();         string jsonResponse = string.Empty;         using (StreamReader sr = new StreamReader(webResponse.GetResponseStream()))           jsonResponse = sr.ReadToEnd();         string[] tokens = jsonResponse.Split(new char[] { '\n' });         if (tokens.Length == 2) {           Boolean success = tokens[0].Equals("true", StringComparison.CurrentCulture);           result.Data = new { Success = success, Message = tokens[1] };         }         else {           result.Data = new { Success = false, Message = "Invalid response returned" };         }       }       catch (Exception ex) {         result.Data = new { Success = false, Message = ex.Message };       }       return result;     }   } }