private void Page_Booking_Loaded(object sender, RoutedEventArgs e)
 {
     connect = new CTUConnection();
     connect.SelectCustomerBooking();
     cmbx_Cust.ItemsSource       = connect.table.DefaultView;
     cmbx_Cust.DisplayMemberPath = "[Name of the customer]";
     cmbx_Cust.SelectedValuePath = "ID";
 }