public ActionResult Update(long idNCC)
        {
            var tk = Session["TaiKhoan"] as KhachHang;

            if (tk == null)
            {
                return(View("../Login/Index"));
            }
            else
            {
                if (tk.LoaiTK != "Admin")
                {
                    return(View("../Home/Index"));
                }
                else
                {
                    var db = new NhaCungCapDAO();
                    Session["UpdateNCC"] = db.Find(idNCC);
                    return(View("Index"));
                }
            }
        }