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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 now 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 time-consuming 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 if the data is valid and how to replace it when needed. It can also hamper performance if the product catalog is too large. A similar but much more sensible approach is to store frequently used information in the ASP .NET cache. Many uses of application state can be replaced more efficiently with caching. Application state information is always stored in process. This means you can use any .NET data types. However, it also introduces the same two limitations that affect in-process session state. Namely, you can t share application state between the servers in a web farm, and you will always lose your application state information when the application domain is restarted an event that can occur as part of ASP.NET s normal housekeeping.

The following are ways to read and navigate the content of an XML file: Using XmlDocument: You can load the document using the XmlDocument class mentioned earlier. This holds all the XML data in memory once you call Load() to retrieve it from a file or stream. It also allows you to modify that data and save it back to the file later. The XmlDocument class implements the full XML DOM. Using XPathNavigator: You can load the document into an XPathNavigator (which is located in the System.Xml.XPath namespace). Like the XmlDocument, the XPathNavigator holds the entire XML document in memory. However, it offers a slightly faster, more streamlined model than the XML DOM, along with enhanced searching features. Unlike the XmlDocument, it doesn t provide the ability to make changes and save them. Using XmlTextReader: You can read the document one node at a time using the XmlTextReader class. This is the least expensive approach in terms of server resources, but it forces you to examine the data sequentially from start to finish. The following sections demonstrate each of these approaches to loading the DVD list XML document.

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If you use this approach, you may find it s still a good idea to set the XmlDataSource.DataFile property at design time in order for Visual Studio to load the schema information about your XML document and make it available to other controls. Just remember to remove this setting when you re finished developing, as the DataFile property overrides the Data property if they are both set.

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.

Figure 12-2 shows the final web page that reads the DVDList.xml document and displays a list of elements, using different levels of indenting to show the overall structure. The XmlDocument stores information as a tree of nodes. A node is the basic ingredient of an XML file and can be an element, an attribute, a comment, or a value in an element. A separate XmlNode object represents each node, and nodes are grouped together in collections. You can retrieve the first level of nodes through the XmlDocument.ChildNodes property. In this example, that property provides access to the <DvdList> element. The <DvdList> element contains other child nodes, and these nodes contain still more nodes and the actual values. To drill down through all the layers of the tree, you need to use recursive logic, as shown in this example.

This allows you to read XML content from another source (such as a database) and still work with the bound data controls. However, it requires adding some custom code. Even if you do use the XmlDataSource.Data property, XML data binding still isn t nearly as flexible as the .NET XML classes you learned about earlier in this chapter. One of the key limitations is that the XML content needs to be loaded into memory all at once as a string object. If you re dealing with large XML documents, or you just need to ensure the best possible scalability for your web application, you might be able to reduce the overhead considerably by using the XmlReader instead, even though it will require much more code. Handling the XML parsing process yourself also gives you unlimited flexibility to rearrange and aggregate your data into a meaningful summary, which isn t always easy using XSLT alone.

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