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This page creates a new private cache on the current computer and then adds a new item to the cache with a dependency on that queue: private string queueName = @".\Private$\TestQueue"; // The leading . represents the current computer. // The following Private$ indicates it's a private queue for this computer. // The TestQueue is the queue name (you can modify this part). protected void Page_Load(object sender, EventArgs e) { if (!this.IsPostBack) { // Set up the queue. MessageQueue queue; if (MessageQueue.Exists(queueName)) { queue = new MessageQueue(queueName); } else { queue = MessageQueue.Create(@".\Private$\TestQueue"); } lblInfo.Text += "Creating dependent item...<br />"; Cache.Remove("Item"); MessageQueueCacheDependency dependency = new MessageQueueCacheDependency(queueName); string item = "Dependent cached item"; lblInfo.Text += "Adding dependent item<br />"; Cache.Insert("Item", item, dependency); } } When you click Send Message, a simple text message is sent to the queue, which will be received almost instantaneously by the custom dependency class: protected void cmdModify_Click(object sender, EventArgs e) { MessageQueue queue = new MessageQueue(queueName); // (You could send a custom object instead // of a string.) queue.Send("Invalidate!"); lblInfo.Text += "Message sent<br />"; } To learn more about Message Queuing, you can refer to Microsoft .NET Distributed Applications (Microsoft Press, 2003).

' Close the reader and show the text readerClose() XmlTextText = strToString() End Sub In the last two lines the procedure concludes by flushing the content in the buffer and closing the reader When using the XmlTextReader, it s imperative you finish your task and close the reader as soon as possible, because it retains a lock on the file, unlike the XmlDocument, which loads all the information into memory when you call the Load() method If you run this code now, you ll see a web page that s quite similar to the earlier examples with the XmlDocument and XPathNavigator The XmlTextReader provides additional methods that help make reading XML even faster and more convenient if you know what structure to expect.

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The GetElementsByTagName() method is fairly limited. It allows you to search based on the name of an element only. You can t filter based on other criteria, such as the value of the element or attribute content. XPath is a much more powerful standard that allows you to retrieve the portions of a document that interest you. XPath uses a pathlike notation. For example, the path / identifies the root of an XML document, and /DvdList identifies the root <DvdList> element. The path /DvdList/DVD selects every <DVD> element inside the <DvdList>. Finally, the period (.) always selects the current node. In addition, the path // is a relative path that searches for nodes anywhere in the document. These ingredients are enough to build many basic templates, although the XPath standard also defines special selection criteria that can filter out only the nodes in which you are interested. Table 12-1 provides an overview of XPath characters. Table 12-1. Basic XPath Syntax

Now that you ve considered the fundamentals of ASP .NET caching, it s worth taking a detour to consider a different performance-enhancing technique. ASP.NET 2.0 introduces a new feature for asynchronous web pages. This specialized feature can help boost the scalability of your website. It s particularly useful in web pages that include time-consuming code that queries a database.

For example, you can use MoveToContent(), which skips over irrelevant nodes (such as comments, whitespace, and the XML declaration) and stops on the declaration of the next element You can also use the ReadStartElement() method, which reads an element start tag and performs basic validation at the same time When you call ReadStartElement(), you specify the name of the element you expect to appear next in the document The XmlTextReader calls MoveToContent() and then verifies that the current element has the name you ve specified If it doesn t, an exception is thrown You can also use ReadEndElement() method to skip over whitespace and read the closing tag for the element Finally, if you want to read an element that contains only text data, you move over the start tag, content, and end tag by using the ReadElementString() method and by specifying the element name.

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