public void LayTrinhDoSoCauVaThoiGian(String lanthi) { SqlDataReader dr = SinhVien.LayThongTinThi(mamonhoc, mL, lanthi); if (dr != null) { socau = (dr.GetInt16(0)).ToString(); trinhdo = dr.GetString(1); thoigianthi = dr.GetInt16(2); } dr.Close(); }