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Unfortunately, this has one significant catch To take advantage of this design, you need to have an asynchronous method that plugs into this infrastructure This means you need a task that launches itself on a separate thread and returns an IAsyncResult object that allows ASPNET to determine when it s complete At first glance, it seems that several possible techniques can accomplish this However, most of these won t work correctly in an ASP NET application For example, seasoned NET developers may expect to use the BeginInvoke() method of a delegate or the ThreadPoolQueueUserWorkItem() method Unfortunately, both of these methods draw from the same thread pool that ASPNET uses, which makes them ineffective When you use these techniques in conjunction with an asynchronous page, you relinquish the original page-processing thread, but you acquire a second thread from the same pool.

Another related standard is XSL (Extensible Stylesheet Language), which is an XML-based language for creating stylesheets. Stylesheets (also known as transforms) are special documents that can be used (with the help of an XSLT processor) to convert your XML documents into other documents. For example, you can use an XSLT stylesheet to transform one type of XML to a different XML structure. Or you could use a stylesheet to convert your XML into another text-based document such as an HTML page, as you ll see with the next example.

Application state is included primarily for backward compatibility with classic ASP. In new applications, it s almost always better to rely on other mechanisms for global data, such as using databases in conjunction with the Cache object.

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(The online examples include a page named SimpleAsyncPageaspx that demonstrates how this works) Another option is to use the Thread class to explicitly create your own threads Unfortunately, this is a risky endeavor, because it can easily lead to a page that creates more work than the server can handle To understand the problem, consider what happens if a page creates a custom thread and that page is requested 100 times in quick succession The web server winds up managing 100 threads, which taxes performance even if these threads are doing no work at all In a popular website, you might create so many threads that the server can t complete any requests Furthermore, the act of thread creation itself has some overhead A good thread pooling system avoids thread creation and maintains a small set of threads at the ready at all times.

Of course, XSL stylesheets shouldn t be confused with CSS (Cascading Style Sheets), a standard used to format HTML. 15 discusses CSS.

You can store global application variables in one other way. You can add static member variables to the global.asax file (which was introduced in 5). These members are then compiled into the custom HttpApplication class for your web application and made available to all pages. Here s an example: public static string[] fileList;

That leaves you with only two options You can write a custom thread pool This means you use the low-level Thread class but take care to limit the total number of threads you ll create This technique is not trivial, and it s beyond the scope of this book You can find an excellent (although not necessarily production-ready) example of a custom thread pool at http://wwwbearcanyoncom/ dotnet/#threadpool So, what s the alternative if you wisely decide not to create a custom thread pool The recommended approach is to use existing support in the NET class library For example, NET includes various classes that provide proper asynchronous support for downloading content from the Web, reading data from a file, contacting a web service, and querying data through a DataReader In general, this support is provided through matching methods named BeginXxx() and EndXxx() For example, the SystemIO.

Before you can perform a transformation, you need to create an XSL stylesheet that defines how the conversion should be applied. XSL is a complex standard in fact, it can be considered a genuine language of its own with conditional logic, looping structures, and more.

The key detail that allows this to work is that the variable is static That s because ASPNET creates a pool of HttpApplication classes to serve multiple requests As a result, each request might be served with a different HttpApplication object, and each HttpApplication object has its own instance data However, there is only one copy of the static data, which is shared for all instances Another requirement is that you must supply the ClassName attribute in the Application directive This assigns a name to the global application class, which you ll need to use to retrieve the static value you ve just created Of course, for the best encapsulation (and the most flexibility), you should use property procedures: private static string[] fileList; public static string[] FileList { get { return fileList; } } When you add a member variable to the global.

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