private void frmPointOfSale_Load(object sender, EventArgs e)
        {
            ICollection <FoodItem> foodItems = FoodItemDB.GetAllFoodItems();

            foreach (FoodItem item in foodItems)
            {
                lbxSaleItem.Items.Add(item);
            }
        }
        private void btnSell_Click(object sender, EventArgs e)
        {
            // TODO: lower item quantity

            // Get item ingredients and lower their quantity
            FoodItem currItem = (FoodItem)lbxSaleItem.SelectedItem;
            ICollection <RawMaterial> itemIngredients = FoodItemDB.GetItemIngredients(currItem.ItemId);

            foreach (RawMaterial item in itemIngredients)
            {
                // TODO: Lower quantity
                // TODO: Update Accounts
            }

            // TODO: Update Accounts for sale
        }