public ActionResult BoMon(string mabm, string tenbm) { var dao = new BoMonDAO(); var res = dao.Noidung(mabm); ViewBag.GV = dao.ListGV(mabm); ViewBag.MH = dao.ListMonHoc(mabm); ViewBag.TenBM = tenbm; if (res == null) { return(View(new Bomon())); } return(View(res)); }