windows phone 7 通過Post提交URL到伺服器,從伺服器擷取資料(比如登陸時候使用)

HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(UrlManager.Login());            myRequest.Method = "POST";            myRequest.ContentType = "application/x-www-form-urlencoded";            myRequest.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), myRequest);private void GetRequestStreamCallback(IAsyncResult asynchronousResult)        {            HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;            System.IO.Stream postStream = request.EndGetRequestStream(asynchronousResult);            // Prepare Parameters String            string parametersString = "username=使用者名稱&password=密碼";            //foreach (KeyValuePair<string, string> parameter in parameters)            //{            //    parametersString = parametersString + (parametersString != "" ? "&" : "") + string.Format("{0}={1}", parameter.Key, parameter.Value);            //}                     byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(parametersString);            // Write to the request stream.            postStream.Write(byteArray, 0, parametersString.Length);            postStream.Close();            // Start the asynchronous operation to get the response            request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);        } private void GetResponseCallback(IAsyncResult asynchronousResult)        {            HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;            HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);            Stream streamResponse = response.GetResponseStream();            StreamReader streamRead = new StreamReader(streamResponse);            string responseString = streamRead.ReadToEnd();            // Close the stream object            streamResponse.Close();            streamRead.Close();       }