public ActionResult Logout()
 {
     try
     {
         RetwisAuthorizeAttribute.DeleteCookie(User.Identity.Name);
         return(RedirectToAction("Index", "Home", null));
     }
     catch (Exception ex)
     {
         return(View("Error", null, ex.Message));
     }
 }
        public ActionResult Login(string username, string password)
        {
            var errorMessage = "Invalid username or password";

            try
            {
                if (retwis.Login(username, password))
                {
                    RetwisAuthorizeAttribute.CreateCookie(username);
                    return(RedirectToAction("Index", "Home", null));
                }
            }
            catch (Exception ex)
            {
                errorMessage = ex.Message;
            }

            return(View("Error", null, errorMessage));
        }
        public ActionResult Register(string username, string password, string password2)
        {
            var errorMessage = "The password is not the same";

            try
            {
                if (password == password2)
                {
                    retwis.Register(username, password);
                    RetwisAuthorizeAttribute.CreateCookie(username);
                    return(View((object)username));
                }
            }
            catch (Exception ex)
            {
                errorMessage = ex.Message;
            }

            return(View("Error", null, errorMessage));
        }