how to post values?

[admin]

hi friends...

can u please tell me how to post a value to a site using C#?
for eg,

in an authentication page, the credentials are passed through posted variables. so the authentication page gets the values as follows.



string uid = Request['username"];
string pwd = Request["password"];
// code to validate credentials.

so, how can i post these variables to this page from anothre application?

i got these code from MSDN but it doesnt work for me.



string uri = "http://localhost/TestAuth/authenticate.aspx";

req = WebRequest.Create(uri);

req.Method = "POST"; // Post method

req.ContentType = "application/x-www-form-urlencoded"; // content type

Stream rs = req.GetRequestStream();

System.Text.ASCIIEncoding ae = new System.Text.ASCIIEncoding();

byte[] postdata = ae.GetBytes( "username=user|password=pwd");

rs.Write(postdata,0,postdata.Length);

rs.Close();

StreamReader rdr = new StreamReader(req.GetResponse().GetResponseStream());

Response.Write(rdr.ReadToEnd());

so what should i do?

thanking,