private void Button_Back(object sender, RoutedEventArgs e)
{
Window Reservationen = new Reservationen();
Reservationen.Show();
this.Close();
}
private void Button_AddReservation(object sender, RoutedEventArgs e)
{
var client = new AutoReservationServiceClient();
var myReservation = (ReservationHinzufügenViewModel)DataContext;
controller.CreateReservation(myReservation);
Window Reservation = new Reservationen();
Reservation.Show();
this.Close();
}