public override async void DidEnterBackground(UIApplication application)
{
await LocalIO.SaveDataAsync();
// Use this method to release shared resources, save user data, invalidate timers and store the application state.
// If your application supports background exection this method is called instead of WillTerminate when the user quits.
}
public override async void OnTerminate()
{
base.OnTerminate();
await LocalIO.SaveDataAsync();
UnregisterActivityLifecycleCallbacks(this);
}