public ActionResult Delete(int id)
        {
            var model = new LibroDeleteModel();

            model.Fill(id);

            return(View(model));
        }
        public ActionResult Delete(LibroDeleteModel model)
        {
            if (model.Delete())
            {
                return(RedirectToAction("Index", "Libro"));
            }

            return(RedirectToAction("Index"));
        }