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Push Notification using FCM in-between web and App

I have tried to implement push Notification in-between from C#.Net(MVC) Web to React Native (Android and IPhone). No Error showing in my code but not show notification in App.
I have tried as reference gave in Stack overflow already
try
{
string server_api_key = ConfigurationManager.AppSettings["SERVER_API_KEY"];
string sender_id = ConfigurationManager.AppSettings["SENDER_ID"];
WebRequest tRequest = WebRequest.Create("https://fcm.googleapis.com/fcm/send");
tRequest.Method = "post";
tRequest.ContentType = "application/json";
tRequest.Headers.Add($"Authorization: key={server_api_key}");
tRequest.Headers.Add($"Sender: id={sender_id}");
var data = new
{
to = "AAAAaQ5neZA:................................XXXX",
priority = "high",
data = new
{
message = response,
name = loginUser.EmployeeName,
userId = uId,
status = true
}
};
var serializer = new JavaScriptSerializer();
var json = serializer.Serialize(data);
Byte[] byteArray = Encoding.UTF8.GetBytes(json);
tRequest.ContentLength = byteArray.Length;
Stream dataStream = tRequest.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
WebResponse tresponse = tRequest.GetResponse();
dataStream = tresponse.GetResponseStream();
StreamReader tReader = new StreamReader(dataStream);
string sResponseFromServer = tReader.ReadToEnd();
tReader.Close();
dataStream.Close();
tresponse.Close();
return sResponseFromServer;
}
catch (Exception)
{
throw;
}

How to implement FCM in ASP.Net C#?

I am using GCM for notifications on Android with c#, but now I want to change GCM to FCM.
What do I have to change for that? Or how can I implement FCM in C#? Any help is appreciated. I am currently using this code for FCM, I just changed URL but it's not working.
try {
msg = message;
var applicationID = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
var SENDER_ID = "xxxxxxxxxxx";
WebRequest tRequest;
//tRequest = WebRequest.Create("https://android.googleapis.com/gcm/send");
tRequest = WebRequest.Create("https://fcm.googleapis.com/fcm/send");
tRequest.Method = "post";
tRequest.ContentType = "application/x-www-form-urlencoded";
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 + "&data.time=" + System.DateTime.Now.ToString() + "&registration_id=" + notificationtoken + "";
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();
notification = sResponseFromServer;
tReader.Close();
dataStream.Close();
tResponse.Close();
return sResponseFromServer;
}
catch (Exception ex)
{
notification.Status = false;
notification = "ERROR DESCRIPTION : " + ex.Message;
}

Try this hope this help you..........
try
{
var applicationID = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
var senderId = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
string deviceId = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
WebRequest tRequest = WebRequest.Create("https://fcm.googleapis.com/fcm/send");
tRequest.Method = "post";
tRequest.ContentType = "application/json";
var data = new
{
to = deviceId,
notification = new
{
body = "This is the message Body",
title = "This is the title of Message",
icon = "myicon"
},
priority = "high"
};
var serializer = new JavaScriptSerializer();
var json = serializer.Serialize(data);
Byte[] byteArray = Encoding.UTF8.GetBytes(json);
tRequest.Headers.Add(string.Format("Authorization: key={0}", applicationID));
tRequest.Headers.Add(string.Format("Sender: id={0}", senderId));
tRequest.ContentLength = byteArray.Length;
using (Stream dataStream = tRequest.GetRequestStream())
{
dataStream.Write(byteArray, 0, byteArray.Length);
using (WebResponse tResponse = tRequest.GetResponse())
{
using (Stream dataStreamResponse = tResponse.GetResponseStream())
{
using (StreamReader tReader = new StreamReader(dataStreamResponse))
{
String sResponseFromServer = tReader.ReadToEnd();
Response.Write(sResponseFromServer);
Label3.Text = sResponseFromServer;
}
}
}
}
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
}

Unable to Push notification by using GCM in android and C#

I have register my device in GCM, but my push GCM doesn't work. What is wrong with my code?
asp.net side
protected void Button1_Click(object sender, EventArgs e)
{
send("APA91bHwwSLPkdIfqxW8gsosp1J1zgUUsHsgY1LFxetxig4Abo3MfYg7mdbvU3gqLMN5VhW08HvHKhxsHzRAqbRs7WtE6jAQux77XZpx9_1p20O9LMrzpa9mw_RmXoyfq5bkxsLEHO7n6ZGWHzmfzZxaimp46GwR8g");
}
void send(string regId)
{
try
{
var applicationID = "tokyo-***se-***12";
var SENDER_ID = "8500****7538";
var value = "push 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}", applicationID));
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=" + 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();
lblStat.Text = sResponseFromServer;
tReader.Close();
dataStream.Close();
tResponse.Close();
}
catch (Exception w)
{
Response.Write(w.Data);
}
}
web.config
<appSettings >
<add key="GOOGLE_API_KEY" value="AIzaSyCuXwVivtKDKBqS2zxGCrD7Cc2Qwpjxgcw"/>
</appSettings>

It looks like you are sending the wrong authorization key here:
tRequest.Headers.Add(string.Format("Authorization: key={0}", applicationID));
You will need to change applicationID here to your API key, which you assigned to GOOGLE_API_KEY.
Lastly, you may want to consider hiding your actual API key from this StackOverflow post.

GCM Using JSON to send to multiple RegistrationIDs : No notification arrives

I'm using Android Google Cloud Messaging to send notifications to a device, with c#.net. I got the API Key, RegistrationID and senderID ( Well first method worked no there's nothing wrong with the configuration of GCM).
Here's the first method where I want to send the message to just 1 registrationID(check postData, i'm not using Json):
public void SendPushNotification(string regID, string message)
{
{
string GoogleAppID = "APIKey";
var SENDER_ID = "SenderID";
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 = "collapse_key=score_update&time_to_live=108&delay_while_idle=1&data.message=" + value + "&data.time=" + System.DateTime.Now.ToString() + "&registration_id=" + 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();
HttpWebResponse httpResponse = (HttpWebResponse)tResponse;
string statusCode = httpResponse.StatusCode.ToString();
tReader.Close();
dataStream.Close();
tResponse.Close();
}
catch {
throw new WebFaultException<string>("Error", HttpStatusCode.ServiceUnavailable);
}
So when calling it, the device successfully receives the message.
Here's my second method, where I use Json format to send to multiple IDs:
(Note that the procedure doesn't take registrationID as a parameter because I added it to the list i declared in the code)
public void SendPushNotification(string message)
{
string stringregIds = null;
List<string> regIDs = new List<string>();
//Here I add the registrationID that I used in Method #1 to regIDs
//Then I use
stringregIds = string.Join("\",\"", regIDs);
//To Join the values (if ever there are more than 1) with quotes and commas for the Json format below
try
{
string GoogleAppID = "APIKey";
var SENDER_ID = "SenderID";
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 = "{\"collapse_key\":\"score_update\",\"time_to_live\":108,\"delay_while_idle\":true,\"data\": { \"message\" : "+"\""+value+"\",\"time\": "+"\""+System.DateTime.Now.ToString()+"\"},\"registration_ids\":[\""+stringregIds+"\"]}";
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();
HttpWebResponse httpResponse = (HttpWebResponse)tResponse;
string statusCode = httpResponse.StatusCode.ToString();
tReader.Close();
dataStream.Close();
tResponse.Close();
}
catch {
throw new WebFaultException<string>("Error", HttpStatusCode.ServiceUnavailable);
}
The Method doesn't give any errors or anything but the notification doesn't arrive in the device. (I console.writelined postData and it's the same format of http://developer.android.com/google/gcm/http.html
So I don't really know what to fix, it would be really easier to send notifications to users at the same time not just send 1 to each User every X seconds.
Thanks.

Changing
Request.ContentType = " application/x-www-form-urlencoded;charset=UTF-8";
to
Request.ContentType = "application/json";
Does answer the question.
He is providing JSON data where he has explicitly implied quite the opposite.
The HTTP header must contain the following headers:
Content-Type: application/json for JSON;
application/x-www-form-urlencoded;charset=UTF-8 for plain text.
See: https://developer.android.com/google/gcm/http.html

Use
Request.ContentType = "application/json";

Replace this line:
Request.ContentType = "application/json";

Push notifications -Error - Missing Registration

I have sent push notification using ASP.net C# by GCM to android mobiles.
But I tried different kinds of code but all arr return Missing Registration error, So please help me.

try PushSharp. it's pretty straightforward.
and check this instruction - How to Configure & Send GCM Google Cloud Messaging Push Notifications using PushSharp
var push = new PushBroker();
//Registering the GCM Service and sending an Android Notification
push.RegisterGcmService(new GcmPushChannelSettings("theauthorizationtokenhere"));
//Fluent construction of an Android GCM Notification
//IMPORTANT: For Android you MUST use your own RegistrationId here that gets generated within your Android app itself!
push.QueueNotification(new GcmNotification().ForDeviceRegistrationId("DEVICE REGISTRATION ID HERE")
.WithJson("{\"alert\":\"Hello World!\",\"badge\":7,\"sound\":\"sound.caf\"}"));
You can install it via nuget.

public class GCMSNS
{
public static string SendGCMNotification(string deviceId, string message)
{
string GoogleAppID = "XYxxxxxxxxxxxxxxxxxxxx";//This is API Key Server
var SENDER_ID = "11111111111111"; //This is Google Project Id
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 = "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;
}
}