private void BtnNew_Click(object sender, RoutedEventArgs e)
{
Booking_DataEntry newWin = new Booking_DataEntry();
newWin.ShowDialog();
UpdateList();
}
private void EditButton_Click(object sender, RoutedEventArgs e)
{
Button button = sender as Button;
Booking booking = button.DataContext as Booking;
int index = lvBookingList.Items.IndexOf(booking);
Booking_DataEntry win = new Booking_DataEntry(booking, false);
win.ShowDialog();
UpdateList(index);
}