public void LoadMarks() { BLLGradeBook objbll = new BLLGradeBook(); objbll.Course_code = cbcourses.SelectedItem.ToString(); List <BLLGradeBook> objlist = new List <BLLGradeBook>(); objlist = objbll.Selectmarksbycourseforteacher(objbll); if (objlist.Count > 0) { dgmarks.DataSource = objlist; dgmarks.DataBind(); } }