public PartialViewResult ShowRequestInventory(int requestNumber)
        {
            ViewBag.requestNumber = requestNumber;
            var inventoryList = _inventoryProvider.GetInventoryByRequestNumber(requestNumber);

            if (inventoryList != null)
            {
                return(PartialView(ToInventoryViewModel(inventoryList)));
            }
            else
            {
                return(null);
            }
        }