public ActionResult Index(SearchFilterVm input = null, Paging paging = null) { if (input == null) { input = new SearchFilterVm(); } input.paging = paging; if (this.ModelState.IsValid) { if (input.submitButton != null) { input.paging.pageNumber = 1; } input = listingManager.search(input); return(View(input)); } return(View(input)); }