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The XPathNavigator works similarly to the XmlDocument class. It loads all the information into memory and then allows you to move through the nodes. The key difference is that it uses a cursorbased approach that allows you to use methods such as MoveToNext() to move through the XML data. An XPathNavigator can be positioned on only one node a time. You can create an XPathNavigator from an XmlDocument using the XmlDocument. CreateNavigator() method. Here s an example (note that you will need to import System.Xml.XPath or use the version in the code download): 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 New XmlDocument() doc.Load(xmlFile) ' Create the navigator. Dim xnav As XPathNavigator = doc.CreateNavigator() XmlText.Text = GetXNavDescr(xnav, 0) End Sub In this case, the returned object is passed to the GetXNavDescr() recursive method, which returns the HTML code that represents the XML structure, as in the previous example. The code of the GetXNavDescr() method is a bit different from the GetChildNodesDescr() method in the previous example, because it takes an XPathNavigator object that is positioned on a single node, not a collection of nodes. That means you don t need to loop through any collections. Instead, you can simply examine the information for the current node, as follows: Private Function GetXNavDescr(ByVal xnav As XPathNavigator, ByVal level As Integer) As String Dim indent As String = "" Dim i As Integer=0 Do While i<level indent &= "     "

Even once you ve created the SqlCacheTablesForChangeNotification table, you still need to enable notification support for each individual table. You can do this manually using the SqlCacheRegisterTableStoredProcedure, or you can rely on aspnet_regsql, using the -et parameter to turn on the notifications and the -t parameter to name the table. Here s an example that enables notifications for the Employees table: aspnet_regsql -et -E -d Northwind -t Employees This step generates the notification trigger for the Employees table.

Now you re ready to start writing the file. The WriteStartDocument() method writes the XML declaration with version 1.0 ( < xml version="1.0" > ), as follows: writer.WriteStartDocument();

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i += 1 Loop Dim str As New StringBuilder("") Select Case xnav.NodeType Case XPathNodeType.Root str.Append("<b>ROOT</b>") str.Append("<br />") Case XPathNodeType.Element str.Append(indent) str.Append("Element: <b>") str.Append(xnav.Name) str.Append("</b><br />") Case XPathNodeType.Text str.Append(indent) str.Append(" - Value: <b>") str.Append(xnav.Value) str.Append("</b><br />") Case XPathNodeType.Comment str.Append(indent) str.Append("Comment: <b>") str.Append(xnav.Value) str.Append("</b><br />") End Select ... Note that the values for the NodeType property are almost the same, except for the enumeration name, which is XPathNodeType instead of XmlNodeType. That s because the XPathNavigator uses a smaller, more streamlined set of nodes. One of the nodes it doesn t support is the XmlDeclaration node type. The function checks if the current node has any attributes. If so, it moves to the first one with a call to MoveToFirstAttribute() and loops through all the attributes until the MoveToNextAttribute() method returns False. At that point it returns to the parent node, which is the node originally referenced by the object. Here s the code that carries this out: ... If xnav.HasAttributes Then xnav.MoveToFirstAttribute() Do str.Append(indent) str.Append(" - Attribute: <b>") str.Append(xnav.Name) str.Append("</b> Value: <b>") str.Append(xnav.Value) str.Append("</b><br />") Loop While xnav.MoveToNextAttribute() ' Return to the parent. xnav.MoveToParent() End If ... The function does a similar thing with the child nodes by moving to the first one with MoveToFirstChild() and recursively calling itself until MoveToNext() returns False, at which point it moves back to the original node, as follows: ... If xnav.HasChildren Then xnav.MoveToFirstChild()

Now you have all the ingredients in place to use the notification system. For example, imagine you cache the results of a query like this: SELECT * FROM Employees This query retrieves records from the Employees table. To check for changes that might invalidate your cached object, you need to know if any record in the Employees table is inserted, deleted, or updated. You can watch for these operations using triggers. For example, here s the trigger on the Employees table that aspnet_regsql creates: CREATE TRIGGER dbo.[Employees_AspNet_SqlCacheNotification_Trigger] ON [Employees] FOR INSERT, UPDATE, DELETE AS BEGIN

The WriteComment() method writes a comment You can use it to add a message with the date and time of creation: writerWriteComment("Created @ " + DateTimeNowToString()); Next, you need to write the real content the elements, attributes, and so on This example builds an XML document that represents a DVD list, with information such as the title, the director, the price, and a list of actors for each DVD These records will be child elements of a parent <DvdList> element, which must be created first: writerWriteStartElement("DvdList"); Now you can create the child nodes The following code opens a new <DVD> element: writerWriteStartElement("DVD"); Now the code writes two attributes, representing the ID and the related category This information is added to the start tag of the <DVD> element .. writerWriteAttributeString("ID", "1"); writerWriteAttributeString("Category", "Science Fiction"); ...

Do str.Append(GetXNavDescr(xnav, level+1)) Loop While xnav.MoveToNext() ' Return to the parent. xnav.MoveToParent() End If Return str.ToString() End Function This code produces almost the same output as shown in Figure 12-2.

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