public ActionResult Details(int?id)
        {
            if (id == null)
            {
                return(new HttpStatusCodeResult(HttpStatusCode.BadRequest));
            }

            CategoriasDTO periodo = categoriasDAO.Find(id);

            if (periodo == null)
            {
                return(HttpNotFound());
            }

            return(PartialView("Details", periodo));
        }