How To Get Parameter From URL

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C#

ASP.NET

Hi to Everyone,

my problem is,
I am using the SMS API in my website for sms sending to user & receiving from user
so when i send the sms they are properly send my code is, for sms sending is

string result = "";
            WebRequest request = null;
            HttpWebResponse response = null;
            try
            {
                String sendToPhoneNumber = ph;
                String msg = "12345erfdr";
                String userid = "20xxxxx";
                String passwd = "rereree";
                String url =
                "http://SMS/Receive.aspx?method=sendMessage&send_to=" + sendToPhoneNumber + "&msg=" + msg + " &userid=" + userid + "&password=" + passwd + "&v=1.1 & msg_type = TEXT & auth_scheme = PLAIN" + "";
                request = WebRequest.Create(url);
                //in case u work behind proxy, uncomment the
                /*WebProxy proxy = new WebProxy("http://proxy:80/",true);
                proxy.Credentials = new NetworkCredential("userId","password", "Domain");
                request.Proxy = proxy;*/
                // Send the 'HttpWebRequest' and wait for response.
                response = (HttpWebResponse)request.GetResponse();
                Stream stream = response.GetResponseStream();
                Encoding ec = System.Text.Encoding.GetEncoding("utf-8");
                StreamReader reader = new
                System.IO.StreamReader(stream, ec);
                result = reader.ReadToEnd();
                Console.WriteLine(result);
                reader.Close();
                stream.Close();
            }
            catch (Exception exp)
            {
                Console.WriteLine(exp.ToString());
            }
            finally
            {
                if (response != null)
                    response.Close();
            }

& for receiving the sms I set the URL of my page on which i receive sms is set to the SMS API Response URL.
& I get the parameter from these response url on my page is,

if (Request.Form["phonecode"] != null)
            {

                pcode = Request.Form["phonecode"].ToString();

            }

but these parameter are not get then how to get these paramter?