private void XoaDonHang()
    {
        string strMaDonHang = (string)Request["MaDonHang"];

        int        maDonHang = int.Parse(strMaDonHang);
        DonHangBUS bus       = new DonHangBUS();
        bool       flag      = bus.XoaDonHang(maDonHang);

        XL_THE        the       = new XL_THE("goc");
        XL_THUOC_TINH thuoctinh = new XL_THUOC_TINH("kq", flag ? "1" : "0");

        the.Danh_sach_thuoc_tinh.Add(thuoctinh);
        string chuoi = the.Chuoi();

        XL_CHUOI.XuatChuoi(Response, chuoi);
    }