public ActionResult Create()
        {
            var model = new LibroCreateModel();

            model.FillGeneros();

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

            ModelState.AddModelError("error", "Este libro ya existe");
            model.FillGeneros();

            return(View(model));
        }