public ActionResult Create(PromocionViewModels promocion)
        {
            if (ModelState.IsValid)
            {
                var dto = Mapper.Map <PromocionViewModels, dtoPromocion>(promocion);

                var bll = new dtoPromocion();
                bll.Crear(dto);

                return(RedirectToAction("Index"));
            }
            else
            {
                string codigo = RandomString();

                ViewBag.CodDescuento = "UAIBAY" + codigo;

                return(View(promocion));
            }
        }