/*
         * Adds a new "shipment" to the database for the given day, item id, and stock quantity
         */
        private void addAvailability(ICatalogView view, AvailabilityEventArgs e)
        {
            CatalogItemsStock shipment = new CatalogItemsStock();

            shipment.CatalogItemId  = e.itemId;
            shipment.AvailableStock = e.itemStock;
            shipment.Date           = e.shipDate;

            _service.CreateAvailableStock(shipment);
            _view.NotifyAvailabilityUpdated();
        }