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Suppose that you want to use an in-line anonymous method or lambda expression, and want a stateful thread. You can do this by using a thread parameter. A thread parameter is like a method parameter, except the data is passed to the instantiated thread and could be considered as a thread constructor. Here s an example of using a thread parameter: Thread thread = new Thread( (buffer) => { Console.WriteLine("You said (" + buffer.ToString() + ")"); }); thread.Start("my text"); The lambda expression now has a parameter. The parameter is the state, which you can manipulate as you would any other variable. Of course, you should not pass the same variable

In this chapter, you learned how to store the shopping cart information in the database, and you learned a few things in the process as well. Probably the most interesting was the way you can store the shopping cart ID as a cookie on the client, because you haven t done anything similar so far in this book. When writing the code for the user interface, you learned how to allow the visitor to update multiple GridView records with a single click. At the end, you updated the administrative part of the web site to deal with the new challenges implied by your custom-created shopping cart. You ll complete the functionality offered by the custom shopping cart in the next chapter with a custom checkout system. You ll add a Place Order button to the shopping cart, which allows you to save the shopping cart information as a separate order in the database. See you in the next chapter!

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our new shopping cart works well, except that it doesn t yet allow your visitors to actually place orders, which is rather troubling since that is the point of all this! We ll deal with that issue in this chapter in two separate stages: 1. First we ll implement the visitor side of the order placement mechanism. More precisely, we ll add a Place Order button to the shopping cart page that creates a PayPal order containing the products in the shopping cart (remember, at this stage, we still don t handle financial transactions ourselves). 2. Next we ll implement a simple orders administration page, so 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 presentation tier (user interface).

instance to multiple threads. Doing so would cause a concurrency problem, and thus a corruption of state. Two restrictions apply to using a thread parameter: you can send only a single parameter, and that parameter must be an object.

value (the mean). Standard deviation is the square root of the variance (described in the next note). For example, given the three sets {0,0,21,21}, {0,7,14,21}, and {9,10,11,12}, each has an average of 10.5. Their standard deviations are 10.5, about 7.8, and about 1.1, respectively. The third set has a much smaller standard deviation than the other two because its values are all close to 10.5. Most business data analysts use standard deviation instead of variance because standard deviation results are simpler to understand and interpret than variance.

The entire order-placing system is related to the Proceed to Checkout button that you re about to add to your shopping cart. Figure 14-1 shows how this button will look after you update the ShoppingCart.aspx page. Looking at the figure, the button looks boring for something that is the center of this chapter s universe. Still, a lot of logic is hidden behind it, so let s consider what you want to happen when the customer clicks that button. Remember that at this stage, it doesn t matter who places the order, but it s important to store information in the database about the products that were ordered. Basically, two things need to happen when the customer clicks the Proceed to Checkout button:

Note Being allowed only a single thread parameter is an inconvenience, but acceptable. The fact that the

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