protected void DataListBindGradeCheck() { DalOperationAboutGradeCheck dal = new DalOperationAboutGradeCheck(); if (ddlTermYear.SelectedValue.Trim() == "all") { dlstGradeCheck.DataSource = dal.GetAllGradeCheckItems().Tables[0]; dlstGradeCheck.DataBind(); } else { dlstGradeCheck.DataSource = dal.GetGradeCheckItemsByTermYear(ddlTermYear.SelectedValue).Tables[0]; dlstGradeCheck.DataBind(); } }