void btnSavePayment_Click(object sender, RoutedEventArgs e)
{
List <BookingPayment> itemSource = gvwBookingPayment.ItemsSource as List <BookingPayment>;
if (itemSource != null && itemSource.Count > 0)
{
List <BookingPayment> saveList = itemSource.Where(i => i.IsChanged).ToList();
if (saveList.Count > 0)
{
Globals.IsBusy = true;
DataServiceHelper.SaveBookingPaymentAsync(saveList, SaveBookingPaymentCompleted);
}
}
}
