public async Task <ActionResult> Index(SearchModel model)
        {
            ProductionService       service = new ProductionService();
            List <SearchProduction> searchProductionList = await service.search(model.CategoryId, model.Criteria);

            int pageSize   = 16;
            int pageNumber = 1;

            return(PartialView("Index", searchProductionList.ToPagedList(pageNumber, pageSize)));
        }