public void removePromo(Promo promo)
{
this.itemPromo.Remove(promo);
this.callback.removePromoSucceed();
capacity = 1;
calculateSubTotal();
}
public void addPromo(Promo promo)
{
if (capacity == 1)
{
this.itemPromo.Add(promo);
this.callback.addPromoSucceed();
calculateSubTotal();
}
else
{
MessageBox.Show("Oopss! Kamu hanya dapat menggunakan salah satu voucher aja", "Ok", MessageBoxButton.OK);
}
}