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Using SQL cache dependencies still entails more complexity than just using a time-based expiration policy. Tip If it s acceptable for certain information to be used without reflecting all the most recent changes (and developers often overestimate the importance of up-to-the-millisecond live information), you may not need it at all.

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.

A full discussion of XML Schema is beyond the scope of this book. However, if you want to learn more, you can consider the excellent online tutorials at http://www.w3schools.com/schema or the standard itself at http://www.w3.org/XML/Schema.

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ASP .NET uses a polling model for SQL Server 2000 and SQL Server 7. Older versions of SQL Server and other databases aren t supported (although third parties can implement their own solutions by creating a custom dependency class). With the polling model, ASP.NET keeps a connection open to the database and uses a dedicated thread to check periodically if a table has been updated. The effect of tying up one connection in this way isn t terribly significant, but the extra database work involved with polling does add some database overhead. For the polling model to be effective, the polling process needs to be quicker and lighter than the original query that extracts the data.

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. 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 returns the string with the content for that node and all its child nodes and attributes. Private Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Dim xmlFile As String = Server.MapPath("DvdList.xml") ' Load the XML file in an XmlDocument. Dim doc As XmlDocument = New XmlDocument() doc.Load(xmlFile) ' Write the description text. XmlText.Text = GetChildNodesDescr(doc.ChildNodes, 0) End Sub When the Page.Load event handler calls GetChildNodesDescr(), it passes an XmlNodeList object that represents the first level of nodes. (The XmlNodeList contains a collection of XmlNode objects, one for each node.) The code also passes 0 as the second argument of GetChildNodesDescr() to indicate that this is the first level of the structure. The string returned by the GetChildNodesDescr() method is then shown on the page using a Literal control.

The .NET Framework allows you to manipulate XML data with a set of classes in the System.Xml namespace (and other namespaces that begin with System.Xml). These types fully support the XML DOM (Document Object Model) Level 2 Core, as defined by the W3C. It also adds classes and methods that make it easier to read and write XML documents; navigate through nodes, attributes, and elements; and query, transform, and manipulate XML data in various ways.

Before you can use SQL Server cache invalidation, you need to enable notifications for the database. This task is performed with the aspnet_regsql.exe command-line utility, which is located in the c:\[WinDir]\Microsoft.NET\Framework\[Version] directory. To enable notifications, you need to use the -ed command-line switch. You also need to identify the server (use -E for a trusted connection and -S to choose a server other than the current computer) and the database (use -d). Here s an example that enables notifications for the Northwind database on the current server: aspnet_regsql -ed -E -d AspNet

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