private void btnTim_Click(object sender, EventArgs e)
        {
            BUS_ChuyenXe cx      = new BUS_ChuyenXe();
            string       idtuyen = cx.GetIDTuyen(cbTuyenXe.SelectedItem.ToString());

            LoadViewCoThoiGian(idtuyen, dpBatDau.Value, dpKetThuc.Value);
        }
        private void cbTuyenXe_SelectedIndexChanged(object sender, EventArgs e)
        {
            BUS_ChuyenXe cx      = new BUS_ChuyenXe();
            string       idtuyen = cx.GetIDTuyen(cbTuyenXe.SelectedItem.ToString());

            LoadView(idtuyen);
        }