Post Xml data to .asmx service Windows Phone 8

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I am trying to post Xml data to .asmx service.

I can't add the service as a service reference to my project. So I have to post data as a Xml format.

I try with this code.

Please tell me what is wrong with my code...

public void doSend()
        {
            StringBuilder completeUrl = new StringBuilder(urlAddress);
            objRequest = (HttpWebRequest)WebRequest.Create(urlAddress.ToString());
            objRequest.ContentType = "application/x-www-form-urlencoded";
            objRequest.Method = "POST";
            objRequest.Headers["SOAPAction"] = "http://tempuri.org/Register";

            myRequestData = string.Format(@"<?xml version=""1.0"" encoding=""utf-8""?> <soap:Envelope xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema"" xmlns:soap=""http://schemas.xmlsoap.org/soap/envelope/""> <soap:Body> <authenticate xmlns=""http://tempuri.org/""> <platformTuru>iPhone</platformTuru> <MusteriNo>NULL</MusteriNo> <request> <username>{0}</username> <getAdslPassword>1</getAdslPassword> <password>{1}</password> </request> </authenticate> </soap:Body> </soap:Envelope>", username.Text, password.Password);
            objRequest.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), objRequest);

            //HttpWebRequestExtensions.GetRequestStream(objRequest);
            //HttpWebRequestExtensions.GetResponse(objRequest);
        }

        private static void GetRequestStreamCallback(IAsyncResult asyncResult)
        {
            HttpWebRequest objHttpWebRequest = (HttpWebRequest)asyncResult.AsyncState;
            // End the operation
            Stream postStream = objHttpWebRequest.EndGetRequestStream(asyncResult);
            Debug.WriteLine("streeaam: " + postStream.ToString());
            // Convert the string into a byte array.

            Debug.WriteLine("RequestData: " + myRequestData);
            byte[] byteArray = Encoding.UTF8.GetBytes(myRequestData);
            // Write to the request stream.
            postStream.Write(byteArray, 0, myRequestData.Length);
            postStream.Close();

            // Start the asynchronous operation to get the response
            objHttpWebRequest.BeginGetResponse(new AsyncCallback(GetResponseCallback), objHttpWebRequest);
        }

        private static void GetResponseCallback(IAsyncResult asyncResult)
        {
            try
            {
                HttpWebRequest objHttpWebRequest = (HttpWebRequest)asyncResult.AsyncState;
                HttpWebResponse objHttpWebResponse = (HttpWebResponse)objHttpWebRequest.EndGetResponse(asyncResult);
                Stream objStreamResponse = objHttpWebResponse.GetResponseStream();
                StreamReader objStreamReader = new StreamReader(objStreamResponse);
                string responseString = objStreamReader.ReadToEnd();            // Got response here
                Debug.WriteLine("Response: " + responseString);
                MessageBox.Show("RESPONSE :" + responseString);
                // Close the stream object
                objStreamResponse.Close();
                objStreamReader.Close();
                objHttpWebResponse.Close();
            }
            catch (WebException e)
            {
                HttpStatusCode code = ((HttpWebResponse)(e).Response).StatusCode;

                Debug.WriteLine("Errorr: " + code.ToString());
            }
        }