c# barcode generator code 39 Dealing with Customer Orders in C#

Maker Code39 in C# Dealing with Customer Orders

CHAPTER
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Dealing with Customer Orders
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he good news is that your shopping cart looks good and is fully functional. The bad news is that it doesn t allow the visitor to actually place an order, which makes the cart totally useless in the context of a production system. We ll deal with that problem in this chapter in two separate stages. In the first part of the chapter, you ll implement the client-side part of the order-placing mechanism. More precisely, you ll add a Place Order button to the shopping cart control, which will allow the visitor to order the products in the shopping cart. In the second part of the chapter, you ll implement a simple orders administration page where the site administrator can view and handle pending orders. The code for each part of the site will be presented in the usual way, starting with the database tier, continuing with the business tier, and finishing with the user interface (UI).
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Implementing an Order Placement System
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The entire order-placement system is related to the Place Order button mentioned earlier. Figure 9-1 shows how this button will look after you update the cart_details componentized template in this chapter.
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Figure 9-1. The shopping cart with a Place Order button
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CHAPTER 9 DEALING WITH CUSTOMER ORDERS
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The button looks quite boring for something that we can honestly say is the center of this chapter s universe. Still, a lot of logic is hidden behind it, so let s talk about what should happen when the customer clicks that button. Remember that at this stage we don t care who places the order, but we do want to store information in the database about the products that were ordered. Basically, two things need to happen when the customer clicks the Place Order button: First, the order must be stored somewhere in the database. This means that you must save the shopping cart s products to an order named HatShop Order nnn and clear the shopping cart. Secondly, the customer is redirected to a PayPal payment page where the customer pays the necessary amount for the order. You can see the PayPal payment page in Figure 9-2.
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Figure 9-2. The PayPal payment page
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Note For the second development stage, we still don t process payments ourselves but use a third-party
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payment processor instead. Now we no longer need the PayPal shopping cart because we implemented our own in the previous chapter. Instead, we ll use the Single Item Purchases option of PayPal, which redirects the visitor directly to a payment page.
A problem that arises when using a third-party payment processor is that the customer can change his mind and cancel the order while at the checkout page. This can result in orders
CHAPTER 9 DEALING WITH CUSTOMER ORDERS
that are saved to the database (the order is saved before the page is redirected to the payment page) but for which payment wasn t completed. Obviously, we need a payment confirmation system, along with a database structure that is able to store status information about each order. The confirmation system that you ll implement is simple. Every payment processor, including PayPal, can be instructed to send a confirmation message after a payment has been processed. We ll allow the site administrator to manually check, in the administration page, which orders have been paid for. These orders are known as verified orders. You ll see later in this chapter how to manage them in the orders-management part of the site.
Note PayPal and its competitors offer automated systems that inform your web site when a payment has
been completed or canceled. However, this book doesn t visit the intimate details of any of these payment systems you ll need to do your homework and study the documentation of your company of choice. The PayPal Instant Payment Notification documentation is included in the Order Management Integration Guide, which can be downloaded at https://www.paypal.com/en_US/pdf/ PP_OrderManagement_IntegrationGuide.pdf.
Now that you have an idea of what to do with that Place Order button, the next major concerns are what order information to store in the database and how to store it. As you saw in previous chapters, deciding how to store information helps you get a better idea of how the whole system works.
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