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In other words, one request isn t counted because two clients access the counter at the same time. To prevent this problem, you need to use the Lock() and Unlock() methods, which explicitly allow only one client to access the Application state collection at a time. protected void Page_Load(Object sender, EventArgs e) { // Acquire exclusive access. Application.Lock(); int count = 0; if (Application["HitCounterForOrderPage"] != null) { count = (int)Application["HitCounterForOrderPage"]; } count++; Application["HitCounterForOrderPage"] = count; // Release exclusive access. Application.Unlock(); lblCounter.Text = count.ToString(); } Unfortunately, all other clients requesting the page will be stalled until the Application collection is released. This can drastically reduce performance. Generally, frequently modified values are poor candidates for application state. In fact, application state is rarely used in the .NET world because its two most common uses have been replaced by easier, more efficient methods: In the past, application state was used to store application-wide constants, such as a database connection string. As you saw in 5, this type of constant can be stored in the web.config file, which is generally more flexible because you can change it easily without needing to hunt through web page code or recompile your application. Application state can also be used to store frequently used information that is timeconsuming to create, such as a full product catalog that requires a database lookup. However, using application state to store this kind of information raises all sorts of problems about how to check whether the data is valid and how to replace it when needed. It can also hamper performance if the product catalog is too large. 24 introduces a similar but much more sensible approach storing frequently used information in the ASP .NET cache. Many uses of application state can be replaced more efficiently with caching.

This controller action is pretty simple. It finds all of the grades and renders all the action without a layout, since it s XML and the layout is a builder template. Here s the view itself (Listing 12-6):

s If you decide to use application state, you can initialize its contents when your application first starts. Tip

Just add the initialization code to the Global.asax file in a method named Application_OnStart(), as described in 5.

xml.instruct! :xml, :version=>"1.0" xml.instruct! 'xml-stylesheet', :href=>'/stylesheets/log.css' xml.grades do @grades.each do |grade| xml.grade do xml.student grade.student.name xml.id grade.id xml.employer grade.student.employer xml.class grade.training_class.name xml.grade grade.percentage_grade xml.took_class_at grade.took_class_at end end end

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The website copying feature is great for transferring files to a test server. However, it doesn t give you the option of precompiling your code. If you re deploying your application to a live web server and you want to keep the source code tightly locked down, you ll want something more. As described earlier in this chapter, you can use the aspnet_compiler command-line utility to compile ASP .NET applications. This functionality is also available in Visual Studio through the website publishing feature. While the website copying feature is designed to let you update individual files (which is ideal when updating a test server), the publishing feature is intended to transfer your entire website in compiled form with a couple of clicks.

Being able to refresh parts of the page automatically is useful. With weather, news, or other information streams that change over time, repainting just the parts that change makes a lot more sense than refreshing the entire page for a few minor changes. Of course, this might not be terribly obvious to users who are trained to click the Refresh button, which is why the Auto Refresh pattern is so often paired with FAT. Auto Refresh offers a significant benefit beyond less work for your user: it also reduces the load on your server. Rather than having thousands of users constantly clicking the Refresh button, you can set a specific polling period that should spread out the requests more evenly. Digg (www.digg.com) is a news site catering to the technology community that uses social bookmarking and community editorial control to publicize interesting stories. The content is user-driven and changes frequently, making it a perfect place to use Auto Refresh (see Figure 1-10).

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