public UsuarioMembership(Usuario us)
 {
     id = us.Id;
       nombre = us.Nombre;
       apellidos = us.Apellidos;
       Rol = us.Rol.Nombre;
       Email =us.Email;
       login = us.Login;
 }
        public ActionResult Index(Usuario model)
        {
            if (Membership.ValidateUser(model.Login, model.Password))
            {

                TempData["horaLogin"] = DateTime.Now;

                FormsAuthentication.RedirectFromLoginPage(model.Login,false);
                return null;

            }

            return View(model);
        }