public ActionResult Login(TaiKhoanVm taiKhoanVm)
        {
            if (ModelState.IsValid)
            {
                if (ValidateRequest)
                {
                    if (taiKhoanVm.TenTaiKhoan == taiKhoanVm.MatKhau)
                    {
                        var id       = new CustomeIdentity(taiKhoanVm.TenTaiKhoan);
                        var roles    = new string[] { "nhanvien" };
                        var pricipal = new CustomePricipal(id, roles);
                        Thread.CurrentPrincipal = pricipal;
                        HttpContext.User        = pricipal;
                        var data = new UserData
                        {
                            UserId  = 1,
                            Email   = "*****@*****.**",
                            Address = "4.34 Chung Cu Nhieu Loc",
                            Roles   = roles
                        };
                        var userData = JsonConvert.SerializeObject(data);
                        var ticket   = new FormsAuthenticationTicket(1, taiKhoanVm.TenTaiKhoan, DateTime.Now,
                                                                     DateTime.Now.AddMinutes(30), true, userData);
                        var strTicket = FormsAuthentication.Encrypt(ticket);
                        var cookie    = new HttpCookie(FormsAuthentication.FormsCookieName, strTicket);
                        cookie.HttpOnly = true;
                        Response.Cookies.Add(cookie);

                        return(RedirectToAction("Index", "Home"));
                    }
                }
            }
            return(RedirectToAction("Index", "TaiKhoan"));
        }
        // GET: TaiKhoan
        public ActionResult Index()
        {
            var taiKhoanVm = new TaiKhoanVm();

            return(View(taiKhoanVm));
        }