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ToString() End Sub Once again, application state items are stored as objects, so you need to cast them when you retrieve them from the collection Items in application state never time out They last until the application or server is restarted or until the application domain refreshes itself (because of automatic process-recycling settings or an update to one of the pages or components in the application) Application state isn t often used, because it s generally inefficient In the previous example, the counter would probably not keep an accurate count, particularly in times of heavy traffic For example, if two clients requested the page at the same time, you could have a sequence of events like this: 1 User A retrieves the current count (432) 2 User B retrieves the current count (432) 3 User A sets the current count to 433 4.

Polling works best with data that s used heavily and changes infrequently. That way, you minimize the overhead of the notification process.

In some situations, you don t need to process the entire XML document. Instead, you need to extract a single piece of information. If you know the element name, you can use the XmlDocument.GetElementsByTagName() method, which searches an entire document and returns an XmlNodeList that contains all the matching XmlNode objects.

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User B sets the current count to 433 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, as follows: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) ' Acquire exclusive access ApplicationLock() Dim count As Integer = CInt(Application("HitCounterForOrderPage")) count += 1 Application("HitCounterForOrderPage") = count ' Release exclusive access ApplicationUnlock() lblCounterText = countToString() End Sub Unfortunately, all other clients requesting the page will now 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 .

ASP .NET gives you the ability to create your own custom cache dependencies by deriving from CacheDependency, in much the same way that SqlCacheDependency does. This feature allows you (or third-party developers) to create dependencies that wrap other databases or to create resources such as message queues, Active Directory queries, or even web service calls. Designing a custom CacheDependency is remarkably easy. All you need to do is start some asynchronous task that checks when the dependent item has changed. When it has, you call the base CacheDependency.NotifyDependencyChanged() method. In response, the base class updates the values of the HasChanged and UtcLastModified properties, and ASP .NET will remove any linked item from the cache. You can use one of several techniques to create a custom cache dependency. Here are some typical examples: Start a timer: When this timer fires, poll your resource to see if it has changed. Start a separate thread: On this thread, check your resource and, if necessary, pause between checks by sleeping the thread. Attach an event handler to another component: When the event fires, check your resource. For example, you could use this technique with the FileSystemWatcher to watch for a specific type of file change (such as file deletion). In every case, you perform the basic initialization (attaching event handlers, creating a separate thread, and so on) in the constructor for your dependency.

For example, the following code retrieves the title of each DVD in the document: // Load the XML file. string xmlFile = Server.MapPath("DvdList.xml"); XmlDocument doc = new XmlDocument(); doc.Load(xmlFile); // Find all the <Title> elements anywhere in the document. StringBuilder str = new StringBuilder(); XmlNodeList nodes = doc.GetElementsByTagName("Title"); foreach (XmlNode node in nodes) { str.Append("Found: <b>"); // Show the text contained in this <Title> element. str.Append(node.ChildNodes[0].Value); str.Append("</b><br />"); } XmlText.Text = str.ToString(); Figure 12-3 shows the result of running this code in a web page.

NET world because its two most common uses have been replaced by easier, more efficient methods:.

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