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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. The site administrator can manually check, in the administration page, which orders have been paid for. The orders for which the payment has been confirmed are known as verified orders. You ll see later in this chapter how to manage them in the order management part of the site.

Figure 13-4. Exception thrown after adding element to the collection, as shown in Visual C# Express The InvalidOperationException is thrown to indicate that you can t add elements to a collection while iterating a collection. The collection classes think it is a bad idea to modify and iterate a collection at the same time. I agree with the collection classes, because doing so could give unpredictable results. The problem in the source code is how to use the collection classes in a multithreaded context. In the example, items are added to the collection while the collection is being iterated. A solution would be to take a snapshot of the collection, and then iterate the snapshot, freeing the main collection for the addition of items. A commonly suggested approach is to use the type System.Collections.ObjectModel.ReadOnlyCollection, as in the following example. ... using System.Collections.ObjectModel; ... List<int> elements = new List<int>(); elements.Add(10); elements.Add(20); Thread thread1 = new Thread( () => { Thread.Sleep(1000); foreach (int item in new ReadOnlyCollection<int>(elements)) { Console.WriteLine("Item (" + item + ")");

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Note PayPal and its competitors offer automated systems that notify your web site when a payment has

been completed or canceled. However, in this book, we don t aim at visiting the intimate details of any of these payment systems you ll need to do your homework and study the documentation of the company you choose. The PayPal Instant Payment Notification documentation is included in the Order Management Integration Guide, which at the time of this writing can be downloaded at https://www.paypal.com/en_US/ pdf/PP_OrderManagement_IntegrationGuide.pdf.

Figure 2-10. Solution Explorer showing the testing console application and Calculator class library

Note The variance is one measure of how widely values are dispersed from the average value (the mean).

Now that you have an idea of what the Proceed to Checkout button will do, the next major concerns are what product order information to store in the database and how to store it. As you saw in the previous chapters, deciding how to store information gives you a better idea of how the whole system works.

Add the boldfaced code to Program.cs in the testing console project to verify the addition of 1 and 2: namespace TestCalculator { class Program { public static void TestSimpleAddition() { int total = Calculator.Operations.Add(1,2); if (total !=3) { Console.WriteLine ("Oops 1 and 2 does not equal 3"); } } static void Main(string[] args){ TestSimpleAddition(); } } }

As pointed out earlier, we start implementing the new feature by creating the necessary data structures. This should not surprise you at this point. You know that deciding what information to use and how to store it helps a great deal when analyzing a new feature and represents the technical foundation of that feature s implementation. There are two types of information that we want to store when an order is placed: Details about the order as a whole: What date was the order created Have the products been shipped, and if so, when And what s the order s status now We ll store this data in a table named Orders, where each record represents an order. Product details for the order: What products were ordered in which order We ll store this data in a table named OrderDetail, where each record represents an ordered product. Many records of this table will be associated with one record in the Orders table, forming a One-to-Many relationship between the tables (you might want to revisit 5, where the table relationships are explained).

Press Ctrl+F5 to test the calculation. When executed, the testing console application calls the test method TestSimpleAddition(), which calls and verifies the functionality of the Calculator class library.

Tip So far, we have been consistent about naming our tables in singular form (ShoppingCart, Department,

Note Recall that the Main() method is where a project begins its operation. To make an application do

and so on). However, here, we make an exception for the Orders table, because ORDER is an SQL keyword. For the purposes of this book, we prefer to break the naming convention to avoid any confusion while writing the SQL code, and generally speaking, it isn t good practice to use SQL keywords as object names.

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