public IEnumerable<CHI_TIEU_TUYEN_SINH_LstResult> CHI_TIEU_TUYEN_SINH_Lst() { try { using (var dataContext = new OOAD_EDUManagementDataContext()) { return dataContext.CHI_TIEU_TUYEN_SINH_Lst().ToList(); } } catch (Exception e) { return null; } }