public ActionResult Create(Province province)
        {
            if (ModelState.IsValid)
            {
                db.Provinces.Add(province);
                db.SaveChanges();
                return(RedirectToAction("Index"));
            }

            return(View(province));
        }
 public void Save()
 {
     try
     {
         context.SaveChanges();
     }
     catch (DbEntityValidationException e)
     {
         foreach (var eve in e.EntityValidationErrors)
         {
             Debug.WriteLine("Entity of type \"{0}\" in state \"{1}\" has the following validation errors:",
                             eve.Entry.Entity.GetType().Name, eve.Entry.State);
             foreach (var ve in eve.ValidationErrors)
             {
                 Debug.WriteLine("- Property: \"{0}\", Error: \"{1}\"",
                                 ve.PropertyName, ve.ErrorMessage);
             }
         }
         throw;
     }
 }
        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

                User user = db.Users.FirstOrDefault(u => u.UserName.ToLower() == model.UserName.ToLower());
                // Check if user already exists
                if (user == null)
                {
                    // Insert name into the profile table
                    db.Users.Add(new User {
                        UserName = model.UserName
                    });
                    db.SaveChanges();

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

                    return(RedirectToLocal(returnUrl));
                }
                else
                {
                    ModelState.AddModelError("UserName", "Tên đăng nhập đã tồn tại. Vui lòng chọn tên khác.");
                }
            }

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