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

            if (CheckThoiGian == 1)
            {
                dt = bus.ChiTietKhachHangTheoLoiNhuan_Tuan(IDKhachHang);
            }
            else if (CheckThoiGian == 2)
            {
                dt = bus.ChiTietKhachHangTheoLoiNhuan_Thang(IDKhachHang);
            }
            else
            {
                dt = bus.ChiTietKhachHangTheoLoiNhuan_Ngay(IDKhachHang, NgayDau, NgayCuoi);
            }
            msds.DataSource = dt;
        }