public IActionResult Manage(int?pageNum)
{
var manufacturers = manufacturersService.GetAllForManaging();
ViewBag.PageNavigation = manufacturers.Count() > GlobalConstants.MaximumCountOfRowEntitiesOnSinglePageForManaging ? "Manage" : null;
var pagedAmmount = manufacturers.ToPagedList(pageNum ?? 1, GlobalConstants.MaximumCountOfRowEntitiesOnSinglePageForManaging);
return(View(pagedAmmount));
}