private void cbbTenCongTrinh_SelectedIndexChanged(object sender, EventArgs e)
        {
            _luongCongTrinhDangChon = ctbll.layLuongCT_CongTrinh(cbbTenCongTrinh.Text);

            dtpNgayBatDau.Value  = ctbll.layNgayBD_CT(cbbTenCongTrinh.Text);
            dtpNgayKetThuc.Value = ctbll.layNgayKT_CT(cbbTenCongTrinh.Text);
        }