private void HienThi()
        {
            DataTable dt = new DataTable();

            if (CheckThoiGian == 1)
            {
                dt = bus.ChiTietSanPhamTheoKhachHang_Tuan(IDSanPham);
            }
            else if (CheckThoiGian == 2)
            {
                dt = bus.ChiTietSanPhamTheoKhachHang_Thang(IDSanPham);
            }
            else
            {
                dt = bus.ChiTietSanPhamTheoKhachHang_Ngay(IDSanPham, NgayDau, NgayCuoi);
            }
            msds.DataSource = dt;
        }