public static void ThemDoUongVaoBan(DoUong sp, int soLuong = 1)
{
var kq = ChiTietBan.TimDoUong(sp.IDDoUong);
//if (kq.Quantity < sp.SoLuongDaMua) return;
if (kq == null)
{
kq = sp;
ds.Add(kq);
kq.SoLuong = soLuong;
}
else
{
kq.SoLuong += soLuong;
}
}
public static void XoaDoUong(int idDuUong)
{
DSDoUong.Remove(ChiTietBan.TimDoUong(idDuUong));
}