unable to login to codeproject using webrequest

WebRequest request = WebRequest.Create("https://www.codeproject.com/script/Membership/LogOn.aspx");

            request.Method = "POST";

            string postData = "email='[DELETED]@gmail.com',password='[DELETED]'";
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);

            request.ContentType = "application/x-www-form-urlencoded";

            request.ContentLength = byteArray.Length;

            Stream dataStream = request.GetRequestStream();

            dataStream.Write(byteArray, 0, byteArray.Length);

            dataStream.Close();

            WebResponse response = request.GetResponse();

            Response.Write(((HttpWebResponse)response).StatusDescription);

            dataStream = response.GetResponseStream();

            StreamReader reader = new StreamReader(dataStream);

            string responseFromServer = reader.ReadToEnd();


            Response.Write(responseFromServer);

            reader.Close();
            dataStream.Close();
            response.Close();