//update the Item
        private void button2_Click(object sender, RoutedEventArgs e)
        {
            //Get the selected item
            string product_Code = listBox.Items.GetItemAt(1).ToString();

            product_Code = product_Code.Remove(0, 15);

            Inventory item = Inventory.GetWithCode(product_Code);

            //update the item quantity
            int newValue;

            if (Int32.TryParse(textBox.Text, out newValue))
            {
                item.ModifyItemStock(newValue);
            }

            //update the listbox
            listBox.Items.Clear();
            listBox.Items.Add("Product : " + item.Product);
            listBox.Items.Add("Product Code : " + item.Product_Code);
            listBox.Items.Add("On Hand : " + item.On_Hand);
            listBox.Items.Add("On Order : " + item.On_Order);
            listBox.Items.Add("Reorder Level : " + item.Reorder_Level);
            listBox.Items.Add("Reorder Quantity : " + item.Reorder_Quantity);
        }
        //Update the selected product
        private void Update_Product_button_Click(object sender, RoutedEventArgs e)
        {
            //Check all of the text/combo box fields
            string product_Code = Product_Code_Textbox.Text.ToString();
            string product_Name = Product_Name_textBox.Text.ToString();
            double list_price, unit_price;
            bool   listPrice, unitPrice, reorderLevel, reorderQuant, onHand;
            int    reorder_level, reorder_quant, on_Hand;

            CheckTextBoxes(out list_price, out listPrice, out unit_price, out unitPrice, out reorder_level, out reorderLevel, out reorder_quant, out reorderQuant, out on_Hand, out onHand);


            if (listPrice && unitPrice && reorderLevel && reorderQuant && onHand && product_Code.Length > 1 && product_Name.Length > 1)
            {
                Product   product   = (Product)listBox.SelectedItem;
                Inventory inventory = Inventory.GetWithCode(product.Product_Code);

                string category = category_comboBox.Text.ToString();

                Product.ChangeProductCategory(product.Product_Id, category);
                Product.UpdateListPrice(product.Product_Id, list_price);

                Inventory.setFiltersToOrder(product.Product_Id, reorder_level, reorder_quant);
                inventory.ModifyItemStock(on_Hand);

                //Re-enable the textboxes that can't be updated in case a new product is to be added
                Product_Code_Textbox.IsEnabled = true;
                Product_Name_textBox.IsEnabled = true;
                Unit_Price_textBox.IsEnabled   = true;

                //reset/update all fields
                listBox.ItemsSource             = Product.GetAll();
                Disc_Product_button.IsEnabled   = false;
                Update_Product_button.IsEnabled = false;
                Add_Product_button.IsEnabled    = true;
                Location_comboBox.IsEnabled     = true;

                ResetBoxesToBlank();
            }
        }