private void SetViewBag1(string selectName = null)// ma lop // dung de tim kiem { DAO_Lop daolop = new DAO_Lop(); var lop1 = daolop.GetByIDTeacher((int)Session[Common.CommonConstant.ID_SESSION]); ViewBag.IDClass = new SelectList(lop1.ToList(), "IDClass", "NameClass"); }