public DataSet getGradeInfo(string gradeName,string gradeNumber,bool isForStu) { using (OptionDataAccess optionDataAccess = new OptionDataAccess()) { try { return optionDataAccess.GetGradeList(gradeName,gradeNumber,isForStu); } catch(Exception e) { Util.WriteLog(e.Message,Util.EXCEPTION_LOG_TITLE); return null; } } }