public ActionResult SuaDoiThongTin(string HoVaTen,string Email,string SoDienThoai,string DiaChi)
        {
            if (WebSecurity.IsAuthenticated)
            {
                if (!WebSecurity.Initialized)
                {
                    WebSecurity.InitializeDatabaseConnection(
                        "DefaultConnection", "UserProfile", "UserId", "UserName",
                        autoCreateTables: false);
                }

                UsersContext uc = new UsersContext();
                UserProfile userProfile = uc.UserProfiles.Where(x => x.UserId == WebSecurity.CurrentUserId).FirstOrDefault();

                userProfile.FullName = HoVaTen;
                userProfile.Email = Email;
                userProfile.PhoneNumber = SoDienThoai;
                userProfile.Address = DiaChi;

                uc.SaveChanges(); //lưu thay đổi
            }
            return RedirectToAction("QuanLyTaiKhoan", "Account");
        }
        public ActionResult ExternalLoginConfirmation(RegisterExternalLoginModel model, string returnUrl)
        {
            string provider = null;
            string providerUserId = null;

            if (User.Identity.IsAuthenticated || !OAuthWebSecurity.TryDeserializeProviderUserId(model.ExternalLoginData, out provider, out providerUserId))
            {
                return RedirectToAction("Manage");
            }

            if (ModelState.IsValid)
            {
                // Insert a new user into the database
                using (UsersContext db = new UsersContext())
                {
                    UserProfile user = db.UserProfiles.FirstOrDefault(u => u.UserName.ToLower() == model.UserName.ToLower());
                    // Check if user already exists
                    if (user == null)
                    {
                        // Insert name into the profile table
                        db.UserProfiles.Add(new UserProfile { UserName = model.UserName });
                        db.SaveChanges();

                        OAuthWebSecurity.CreateOrUpdateAccount(provider, providerUserId, model.UserName);
                        OAuthWebSecurity.Login(provider, providerUserId, createPersistentCookie: false);

                        return RedirectToLocal(returnUrl);
                    }
                    else
                    {
                        ModelState.AddModelError("UserName", "User name already exists. Please enter a different user name.");
                    }
                }
            }

            ViewBag.ProviderDisplayName = OAuthWebSecurity.GetOAuthClientData(provider).DisplayName;
            ViewBag.ReturnUrl = returnUrl;
            return View(model);
        }