How to add the header in the WebRequest .
 HttpWebRequest tRequest = (HttpWebRequest)WebRequest.Create("https://fcm.googleapis.com/fcm/send");
            tRequest.Method = "POST";
            tRequest.ContentType = "application/json";
            var data = new
            {
                to = devicesId,
                notification = new
                {
                    body = "Fcm Test Notification",
                    title = "Test FCM",
                    sound = "Enabled"
                },
                priority = "high"
            };
            tRequest.Headers["Authorization: key={0}"] = appId;
            tRequest.Headers["Sender: id={0}"] = senderId; 
i need to add the header to create the web Request.
Thanks