WebClient thriugh 401 authentication error

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.NET

Hi,

I'm trying to download the web page source code from a HTTPS URL, my code is as follows:

System.Net.WebClient WC = new System.Net.WebClient();

           NetworkCredential Cred = new NetworkCredential();
           Cred.UserName = "user";
           Cred.Password = "pass";

           WC.Credentials = Cred;

           System.IO.Stream s = WC.OpenRead("https://xxxxxx/data.html");
           System.IO.StreamReader sr = new System.IO.StreamReader(s);
           string webpage = sr.ReadToEnd();

I get a 401 (unauthorized) exception, and i am 100% sure the credentials are correct, and work perfectly in my web browser for the file.

I have tested this code without the credentials, on a standard HTTP URL and it works fine.

Any ideas what I am doing wrong?

Thanks for any help