How to update records from our application to another appication!

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C#

Hi,

Can any one help me on this like i wants to access one site to another by passing regarding values and also i tried the below code that shows below

using System;
using System.Web;  // for HttpUtility class
using System.Threading;
using System.Text; // for Encoding class
using System.Net;  // for HttpWebRequest class
using System.IO;   // for StreamReader class

namespace sampleexe
{
    class Class1
    {
        [STAThread]
        static void Main(string[] args)
    {
            
        string url = "http://localhost:3974/Default.aspx";


      string viewstate = InitialViewState(url);

      viewstate = HttpUtility.UrlEncode(viewstate);
      string data = "TextBox1=red&TextBox2=empty&Button1=clicked&__VIEWSTATE="+viewstate;
      byte[] buffer = Encoding.UTF8.GetBytes(data);
      string proxy = null;

      WebRequest req = WebRequest.Create(url);
      req.Method = "POST";
      req.ContentType = "application/x-www-form-urlencoded";
      req.ContentLength = buffer.Length;
      req.Proxy = new WebProxy(proxy, true); // ignore for local addresses
      

      Stream reqst = req.GetRequestStream(); // add form data to request stream
      reqst.Write(buffer, 0, buffer.Length);
      reqst.Flush();
      reqst.Close();

      Console.WriteLine("\nPosting 'red' to " + url);
      try
      {
          
          req.Credentials = CredentialCache.DefaultCredentials;
         // HttpWebResponse response = (HttpWebResponse)req.GetResponse();
          HttpWebResponse res = (HttpWebResponse)req.GetResponse(); // send request,  get response
          Console.WriteLine("\nResponse stream is: \n");
          Stream resst = res.GetResponseStream(); // display HTTP response
          StreamReader sr = new StreamReader(resst);
          Console.WriteLine(sr.ReadToEnd());
          sr.Close();
          resst.Close();
      }
      catch (System.Net.WebException ex)
      {
          String responseFromServer = ex.Message.ToString() + " ";
          if (ex.Response != null)
          {
              using (WebResponse response = ex.Response)
              {
                  Stream data11 = response.GetResponseStream();
                  using (StreamReader reader = new StreamReader(data11))
                  {
                      responseFromServer += reader.ReadToEnd();
                  }
              }
          }
          Console.WriteLine(responseFromServer);

      } 
      
  
      Console.WriteLine("\nDone");
      Console.ReadLine();
    } // Main()

        static string InitialViewState(string url)
        {
            WebClient wc = new WebClient();
            Stream st = wc.OpenRead(url);
            StreamReader sr = new StreamReader(st);
            string line;
            while ((line = sr.ReadLine()) != null)
            {
                if (line.IndexOf("__VIEWSTATE") != -1) // found line
                {
                    sr.Close();
                    st.Close();
                    int startIndex = line.IndexOf("value=") + 7;
                    int endIndex = line.IndexOf("\"", startIndex);
                    int count = endIndex - startIndex;
                    return line.Substring(startIndex, count);
                }

            }
            sr.Close();
            st.Close();
            return "not found";
        } // InitialViewState()

    } // Class1
} // ns PostToASPdotNET

here the error i'm getting is "The remote server returned an error: (500) Internal Server Error.System.Net.HttpWebRequest.GetResponse()"

Please help me on this to resolve!