Problem with Request and response

See more:

C#

ASP.NET

The problem that I am facing at the moment is to extract User:Password fromt he following URL :
HTTPS://User:Password@www.myURL.com/default.aspx?address=xyz&phone=234563

Request Method is POST. Implementation of the above example is done as follows:
I have two pages one Creates a REquest object and the other page Gets the Request using Request.Url.toString()

The code for the page sending the request is as follows:

HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://User:Password@localhost:2721/TestWebApp/Default.aspx");
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
string strNewValue = @"&MessageId=123&DestinationAddress=46762050312";
req.ContentLength = strNewValue.Length;
// Write the request
StreamWriter stOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
stOut.Write(strNewValue);
stOut.Close();
HttpWebResponse res = (HttpWebResponse) req.GetResponse();
Stream resst = res.GetResponseStream();
StreamReader sr = new StreamReader(resst);
string response = sr.ReadToEnd();
Response.Write(response);

Page receiving the request is coded as follows:

string    str = Request.Url.ToString();

On receiving the request "str" only contains: http://localhost:2721/TestWebApp/Default.aspx
User: Password is missing .

Please let me know how can I retrieve the USer and password from above URL.