BackgroundTaskFromForeground.MainPage.UpdateTile_Click C# (CSharp) Method

        private async void UpdateTile_Click(object sender, RoutedEventArgs e)
        {
            // Task hasn't been registered, show message
            if (backgroundTrigger == null)
            {
                MessageDialog infoDialog = new MessageDialog("Can't run task if it hasn't been registered.", "Info");
                await infoDialog.ShowAsync();

                return;
            }

            var taskParameters = new ValueSet();

            // Send a custom message if we have typed one
            if (!string.IsNullOrEmpty(MessageText.Text))
            {
                taskParameters.Add("Message", MessageText.Text);
            }

            // Fetch execution results and inform user accordingly
            var taskResult = await backgroundTrigger.RequestAsync(taskParameters);

            switch (taskResult)
            {
                default:
                case ApplicationTriggerResult.Allowed:
                    MessageDialog infoDialog = new MessageDialog("Background task successfully executed.", "Info");
                    await infoDialog.ShowAsync();
                    break;
                case ApplicationTriggerResult.CurrentlyRunning:
                case ApplicationTriggerResult.DisabledByPolicy:
                case ApplicationTriggerResult.UnknownError:
                    MessageDialog errorDialog = new MessageDialog("Error running background task: " + taskResult.ToString(), "Error");
                    await errorDialog.ShowAsync();
                    break;
            }
        }
    }