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You can store global application variables in one other way. You can add Shared 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 Shared fileList as String() The key detail that allows this to work is that the variable is Shared. That s because ASP.NET 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, only one copy of the shared data exists, 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 Shared value you ve just created. Of course, for the best encapsulation (and the most flexibility), you should use property procedures: Private Shared strFileListAs String() Public Shared ReadOnly Property FileList() As String() Get Return strFileList End Get End Property

Figure 12-2. Retrieving information from an XML document When the example page loads, it creates an XmlDocument object and calls the Load() method, which retrieves the XML data from the file. It then calls a recursive function in the page class named GetChildNodesDescr(). GetChildNodesDescr() takes an XmlNodeList object as an input and the index of the nesting level. It then displays the string with the content for that node and all its child nodes and attributes in a label named lblXml. private void Page_Load(object sender, System.EventArgs e) { string xmlFile = Server.MapPath("DvdList.xml"); // Load the XML file in an XmlDocument. XmlDocument doc = new XmlDocument(); doc.Load(xmlFile); // Write the description text to a label. lblXml.Text = GetChildNodesDescr(doc.ChildNodes, 0); }

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Note If you do use the XmlDataSource to display XML data from a file, make sure you use caching to reduce the number of times that the file needs to be opened with the CacheDuration, CacheDependency, and CachePolicy properties. If your file changes infrequently, you ll be able to keep it in the cache indefinitely, which guarantees good performance. On the other hand, if you need to update the underlying XML document frequently, you re likely to run into multiuser concurrency headaches, as discussed in 13.

When you add a member variable to the globalasax file, it has essentially the same characteristics as a value in the Application collection In other words, you can use any NET data type, the value is retained until the application domain is restarted, and state isn t shared across computers in a web farm However, there s no automatic locking Because multiple clients might try to access or modify a value at the same time, you should use the SyncLock statement to temporarily restrict the variable to a single thread Depending on how your data is accessed, you might perform the locking in the web page (in which case you could perform several tasks at once with the locked data) or in the property procedures or methods in the globalasax file (in which case the lock would be held for the shortest possible time).

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