public PageByCountry()
{
InitializeComponent();
Photoset ps = new Photoset();
listviewPhotos.ItemsSource = ps.getByCountryGrouped();
}
//private async void MainPage_Loaded(object sender, RoutedEventArgs e)
private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Collapsed;
Photoset ps = new Photoset();
//this.cvs1.Source = await ps.getByCountryGrouped();
this.cvs1.Source = ps.getByCountryGrouped();
preloader.Visibility = Visibility.Collapsed;
}