Getting page source from post method page in C#

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C#4.0

I am trying to get result page source in post method , give inputs in first page and get result page source. Actually it have referral url.

i am trying below code but i am getting first page source code
i can not getting second page source code.


please solve this issue

Thank you.

What I have tried:

string strURL = "";
           string strPostData = "";
           string strResult = "";
           HttpWebRequest wbrq = default(HttpWebRequest);
           HttpWebResponse wbrs = default(HttpWebResponse);
           StreamWriter sw = default(StreamWriter);
           StreamReader sr = default(StreamReader);
           strURL = "http://cbseresults.nic.in/aieee/cbseaieee.asp";
           strPostData = string.Format("regno", "20616948");
           wbrq = WebRequest.Create(strURL);
           wbrq.Method = "POST";
           wbrq.Referer = "http://cbseresults.nic.in/aieee/cbseaieee.asp";
           wbrq.ContentLength = strPostData.Length;
           wbrq.ContentType = "application/x-www-form-urlencoded";
           StreamWriter sw= new StreamWriter(wbrq.GetRequestStream);
            sw.Write(strPostData);
            sw.Close();
            wbrs = wbrq.GetResponse();
            StreamReader sr = new StreamReader(wbrs.GetResponseStream);
            strResult = sr.ReadToEnd().Trim();
            sr.Close();
            richTextBox1.Text = strResult;