Close app after calling smscomposetask - windows-phone-8

Question

I tried using the following code but its not working as the app closes immediately without even showing compose message task:
private void Button_Click_1(object sender, RoutedEventArgs e)
{
SmsComposeTask smsComposeTask = new SmsComposeTask();
smsComposeTask.To = number;
smsComposeTask.Body = "I'll call you back.";
smsComposeTask.Show();
Application.Current.Terminate();
}
Is there a way to close app after this button is clicked and sms task has been completed?

Answer 1

i added a 500ms delay between show task and terminate.
the app went tombstone in this time and couldn't execute terminate statement.
smsComposeTask.Show();
System.Threading.Thread.Sleep(500);
Application.Current.Terminate();

Answer 2

I assume that you're trying to make a shortcut app and hence you would like the app to close after launching the specified Task.
There's no need to use Thread.Sleep as there is a better approach for achieving the same.
You can call your SmsComposeTask in the App.xaml.cs file in the Application_Launching event
And then call the Application.Current.Terminate(); when the app is sent to Background in the Deactivated Event (Application_Deactivated)

Answer 3

Looks like your app closed before the separate messaging app starts.
Why do you need to close the app? It's in the tombstoning state if you launch a messaging task (from MSDN):
Windows Phone applications are not able to directly access common information stores such as the contacts list or to directly invoke other applications such as phoning or messaging. To support scenarios requiring common tasks such as phoning or messaging, the Windows Phone provides a set of launcher and chooser APIs that enables applications to access these useful phone features indirectly. The launcher and chooser APIs invoke distinct built-in applications that replace the currently running application.)