public ActionResult Login(LoginViewModel model, string returnUrl) { if (!ModelState.IsValid) { return(View(model)); } if (accountRepository.AuthenticateUser(model)) { FormsAuthentication.SetAuthCookie(model.Username, false); return(RedirectToAction("Index", "Twitterhome")); } else { ModelState.AddModelError("", "Invalid login attempt."); return(View(model)); } }