Display message delivered by GCM Server C# ASP.NET

string regId "xxxxxxxxxxx";

var applicationID = "xxxxxxxxxxx";

var SENDER_ID = "456789";

var value = txtmsg.Text; 

WebRequest tRequest;

tRequest = WebRequest.Create("https://android.googleapis.com/gcm/send");

tRequest.Method = "post";

tRequest.ContentType = "application/json";

tRequest.Headers.Add(string.Format("Authorization: key={0}", applicationID));

tRequest.Headers.Add(string.Format("Sender: id={0}", SENDER_ID));

string postData = "{\"data\": { \"message\" : " + "\"" + value + "\",\"time\": " + "\"" + System.DateTime.Now.ToString() + "\"},\"registration_ids\":[\"" + regId + "\"]}";

Byte[] byteArray = Encoding.UTF8.GetBytes(postData);

tRequest.ContentLength = byteArray.Length;

Stream dataStream = tRequest.GetRequestStream();

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

dataStream.Close();

WebResponse tResponse = tRequest.GetResponse();

dataStream = tResponse.GetResponseStream();

StreamReader tReader = new StreamReader(dataStream);

String sResponseFromServer = tReader.ReadToEnd(); 

lblresponse.Text = sResponseFromServer; 

tReader.Close();

dataStream.Close();

tResponse.Close();