Untitled

public partial class App : Application
    {
        public App ()
        {
            InitializeComponent();

            MainPage = new NavigationPage(new StartPage());
        }

        protected override void OnStart ()
        {
            Debug.WriteLine("Application onStart");
        }

        protected override void OnSleep ()
        {
            Debug.WriteLine("Application onSleep");
        }

        protected override void OnResume ()
        {
            Debug.WriteLine("Application onResume");
        }
    }