private void BtnNavigateWithObject_Click(object sender, RoutedEventArgs e)
        {
            //NavigationService.Navigate(new Uri("Page2.xaml", UriKind.Relative));
            var nextPage = new Page2();

            NavigationService.Navigate(nextPage);
        }
        private void btnNavigateWithUri_Click(object sender, RoutedEventArgs e)
        {
            var nextPage = new Page2();

            NavigationService.Navigate(nextPage);
        }