public static void SendAppleNotification()
        {
            // Configuration (NOTE: .pfx can also be used here)
            byte[] arr = File.ReadAllBytes("D:\MySoftware\pa_Dev.pem");

            var config = new ApnsConfiguration(ApnsConfiguration.ApnsServerEnvironment.Sandbox,
     arr, "1234");

            // Create a new broker
            var apnsBroker = new ApnsServiceBroker(config);

            // Wire up events
            apnsBroker.OnNotificationFailed += (notification, aggregateEx) => {

                aggregateEx.Handle(ex => {

                    // See what kind of exception it was to further diagnose
                    if (ex is ApnsNotificationException)
                    {
                        var notificationException = (ApnsNotificationException)ex;

                        // Deal with the failed notification
                        var apnsNotification = notificationException.Notification;
                        var statusCode = notificationException.ErrorStatusCode;

                        Console.WriteLine($"Apple Notification Failed: ID={apnsNotification.Identifier}, Code={statusCode}");

                    }
                    else
                    {
                        // Inner exception might hold more useful information like an ApnsConnectionException
                        Console.WriteLine($"Apple Notification Failed for some unknown reason : {ex.InnerException}");
                    }

                    // Mark it as handled
                    return true;
                });
            };

            apnsBroker.OnNotificationSucceeded += (notification) => {
                Console.WriteLine("Apple Notification Sent!");
            };

            // Start the broker
            apnsBroker.Start();


                // Queue a notification to send
                apnsBroker.QueueNotification(new ApnsNotification
                {
                    DeviceToken = "660E4433785EFF2B2AA29D5076B039C969F1AADD839D79261328F40B08D26497",
                    Payload = JObject.Parse("{"aps":{"badge":7}}")
                });


            // Stop the broker, wait for it to finish
            // This isn't done after every message, but after you're
            // done with the broker
            apnsBroker.Stop();


        }