public ActionResult DanhSachDichVu(int maHoaDon)
        {
            var dao = new HoaDonDao();

            ViewBag.ThongTinHoaDon = dao.TimMaHoaDonTrongCTHD(maHoaDon);
            ViewBag.ThongTinDichVu = new DichVuDao().ListAll();
            return(View());
        }
        public ActionResult ThanhToan(int maHoaDon)
        {
            var dao   = new HoaDonDao();
            var model = dao.ViewDentail(maHoaDon);

            ViewBag.ThongTinHoaDon = dao.TimMaHoaDonTrongCTHD(maHoaDon);
            ViewBag.ThongTinDichVu = dao.timDichVuTheoMaHoaDon(maHoaDon);
            return(View(model));
        }