public ActionResult GetMenu()
        {
            var           db       = new QuanLyCuaHangThoiTrangDbContext();
            List <string> quyenStr = new List <string>();
            var           user     = (NguoiDung)Session["Account"];
            var           quyen    = (List <Quyen>)null;

            if (user != null)
            {
                quyen = (from pq in db.PhanQuyens
                         join q in db.Quyens on pq.MaQuyen equals q.MaQuyen
                         where pq.MaChucVu == user.MaChucVu
                         select new Quyen
                {
                    MaChucVu = pq.MaChucVu,
                    MaQuyen = pq.MaQuyen,
                    TenQuyen = q.TenQuyen
                }).ToList();

                foreach (var item in quyen)
                {
                    quyenStr.Add(item.TenQuyen);
                }
                TempData["ListMenu"] = quyenStr;
            }
            return(null);
        }