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1. First, the order must be stored somewhere in the database. You ll create a couple of new tables (Orders and OrderDetail) and write the code that saves the ordered products to these tables. 2. Secondly, the customer must be redirected to a PayPal payment page where the customer pays the necessary amount for the order.

single parameter is an object is not understandable, since we have .NET generics. Nonetheless, we need to respect those two restrictions on using thread parameters.

Note Since we re in development phase 2, you still don t do the credit card transactions yourself, but use a third- party payment processor instead. You no longer need the PayPal shopping cart because you implemented your own in the previous chapter. Instead, as you ll see, you ll use the Single Item Purchases option of PayPal, which redirects the visitor directly to a payment page.

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When you have two threads and both share state (such as a variable), a concurrency situation may arise. Sharing state between two independent threads is not a problem if both threads consider the data as read-only. In a multiple-core multiprocessor machine (as illustrated in Figure 13-3), what would happen if one thread on one core read the state of an object, and another thread on the other core modified the state of the object What does the reading thread read Is the state consistent It is probably not consistent, and that is why you need to synchronize access to state. Let s consider a simple .NET collection class example. The following source code executes in the calling thread, instantiates a list collection, and then adds two numbers to the collection. List<int> elements = new List<int>(); elements.Add(10); elements.Add(20); In the next step, we define the source code for a thread that iterates the elements collection. Thread thread1 = new Thread( () => { Thread.Sleep(1000); foreach (int item in elements) { Console.WriteLine("Item (" + item + ")"); Thread.Sleep(1000); } }); This thread iterates the data, and the two Thread.Sleep() calls put the threads to sleep for 1000 milliseconds, or 1 second. By putting the thread to sleep, we can artificially construct a situation where another thread adds to the collection while the collection is being iterated. The thread that adds an element to the collection is defined as follows: Thread thread2 = new Thread( () => { Thread.Sleep(1500); elements.Add(30); });

STDEVP: Similar to STDEV, calculates standard deviation, but based on the entire population given as arguments. The standard deviation is a measure of how widely values are dispersed from the average value (the mean). For example, =STDEVP(20,40,95,60,100) returns around 30.9 (dispersed from the average value of 63). STDEVP assumes that the list is the entire list of values. If this list is not the entire list of values but just a portion, use STDEV instead. VAR: Estimates variance based on a sample. For example, =VAR(20,40,95,60,100) returns 1,195. VAR assumes that the list is not the entire list of values. If this list is indeed the entire list of values and not just a portion, use VARP instead.

A problem that arises when using a third-party payment processor is that the customer can change her mind and cancel the order while at the checkout page. This can result in 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. This makes it obvious that a payment confirmation system is necessary, along with a database structure able to store status information about each order.

Both threads are started as follows: thread1.Start(); thread2.Start(); Running the threaded code will generate an exception, but not immediately. First, the caller thread creates and starts thread1 and thread2. thread1 goes to sleep for 1 second, and thread2 goes to sleep for 1.5 seconds. After thread1 awakens, one item in the collection is iterated, and thread1 goes to sleep for another second. But before thread1 reawakens, thread2 awakens and adds an element to the collection. When thread1 reawakens and attempts to iterate another element in the collection, an exception is generated, as shown in Figure 13-4.

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