public ActionResult Login(FormCollection collection)
        {
            UserServiceModel user = new UserServiceModel();

            user.Usuario    = collection["Usuario"];
            user.Contrasena = collection["Contrasena"];
            bool loginOK = user.validateUserLogin();

            if (loginOK)
            {
                return(RedirectToAction("Index"));
            }
            else
            {
                return(View());
            }
        }