Overrid OnBackgroundActivated to communicate with win32

app.xaml.cs

        protected async override void OnBackgroundActivated(BackgroundActivatedEventArgs args)
        {

            base.OnBackgroundActivated(args);

            if (args.TaskInstance.TriggerDetails is AppServiceTriggerDetails)
            {

                appServiceDeferral = args.TaskInstance.GetDeferral();
                args.TaskInstance.Canceled += OnTaskCanceled; // Associate a cancellation handler with the background task.

                AppServiceTriggerDetails details = args.TaskInstance.TriggerDetails as AppServiceTriggerDetails;
                Connection = details.AppServiceConnection;
                
                // Send request to win32
                await SendRequestToWin32();
            }
        }