PushSharp - Android GCM push notification

In this article I will try to explain how we can integrate a push notification service for Android using ASP.NET and C#. We all know that mobile applications are booming the market trend. Some custom mobile applications use the push notification service to give updates to application users. Here I will explain how we can use Google’s GCM push notification service.

Class file "AndroidGCMPushNotification.cs"

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net;
using System.Text;
using System.IO;
using System.Security.Cryptography.X509Certificates;
using System.Net.Security;
using System.Collections.Specialized;

/// <summary>
/// Summary description for AndroidGCMPushNotification
/// </summary>
public class AndroidGCMPushNotification
{
	public AndroidGCMPushNotification()
	{
		//
		// TODO: Add constructor logic here
		//
	}
    public string SendNotification(string deviceId, string message)
    {
        string GoogleAppID = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx";        
        var SENDER_ID = "9999999999";
        var value = message;
        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}", GoogleAppID));

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

        // string postData = "{ 'registration_id': [ '" + regId + "' ], 'data': {'message': '" + txtMsg.Text + "'}}";
        string postData = "collapse_key=score_update&time_to_live=108&delay_while_idle=1&data.message=" + value + "&data.time=" + System.DateTime.Now.ToString() + "&registration_id=" + deviceId + "";
        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();

        
        tReader.Close();
        dataStream.Close();
        tResponse.Close();
        return sResponseFromServer;
    }
}

You can call SendNotification function by passing device Id and Message.

AndroidGCMPushNotification apnGCM = new AndroidGCMPushNotification();
string strResponse = apnGCM.SendNotification("9999xxxxxxxxxxxxxxxx", "Test Push Notification message ");