C#

RegId = Id;
                            //SENDER_ID = dt.Rows[i]["imeie"].ToString();
                            SENDER_ID = "1234567";
                            ApplicationID = "Google ID";
                            var value = txtnotofication.Text; //message text box

                            WebRequest tRequest;
                            tRequest = WebRequest.Create("https://android.googleapis.com/gcm/send"); tRequest.Method = "post";
                            tRequest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
                            tRequest.Headers.Add(string.Format("Authorization: key={0}", ApplicationID)); tRequest.Headers.Add(string.Format("Sender: id={0}", SENDER_ID));
                           

                            string postData = "collapse_key=score_update&time_to_live=108&delay_while_idle=1&data.message= {\"message\" : \"demo msg\",\"imgUrl\": \"http://justcash.co.in/img/logo0011.png \"}&data.time=" + System.DateTime.Now.ToString() + "&registration_id=" + RegId + "";

                                                        Console.WriteLine(postData);

                            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();  //Get response from GCM server 
                           // Response.Write("tReader");
                            //label_Result.Text = sResponseFromServer; //Assigning GCM response to Label text

                            tReader.Close(); dataStream.Close();
                            tResponse.Close();