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You create an XPathNavigator from any class that inherits from the XmlNode class using the CreateNavigator() method: XPathNavigator ^nav = doc->CreateNavigator(); At this point, your navigator is pointing to the location of the node that you created it from To set it at the first element of the DOM tree, you need to call the navigator s MoveToRoot() method: nav->MoveToRoot(); Using recursion still holds true for XPathNavigator navigation as it does for standard XmlDocument navigation You will probably notice that it has many similarities to the XmlDocument reader example The biggest difference, though, is that with an XPathNavigator you need to navigate back out of a child branch before you can enter a new branch Therefore, you see the use of the MoveToParent() method much more frequently.

Life becomes a bit more interesting if you want a target property to be influenced by more than one source for example, if you want there to be two equally legitimate bindings that set its property. At first glance, this doesn t seem possible. After all, when you create a binding, you can point to only a single target property. However, you can get around this limitation in several ways. The easiest approach is to change the data binding mode. As you learned in the previous section, the Mode property allows you to change the way a binding works so that values aren t just pushed from the source to the target but also from the target to the source. Using this technique, you can create multiple binding expressions that set the same property. The lastset property is the one that comes into effect. To understand how this works, consider a variation of the slider bar example that introduces a text box where you can set the exact font size you want. In this example (shown in Figure 16-4), you can set the TextBlock.FontSize property in two ways by dragging the slider thumb or by typing a font size into the text box. All the controls are synchronized so that if you type a new number in the text box, the font size of the sample text is adjusted and the slider thumb is moved to the corresponding position.

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Something that you have to get used to if you have been using XmlDocument and XmlNode navigation is that the move methods return Boolean success values In other words, to find out if you successfully moved to the next node, you need to check whether the move method returned true If the move method can t successfully move to the next node, then it returns false The move ends up changing an internal pointer in the XPathNavigator This is considerably different than navigating with XmlNodes, where the nodes return the value of the next node or null if they can t navigate as requested..

users set up for a project. Log on as one user and make a change to the file. Log off and then log on as the other user, make a change, and check in the file. Then log off and log on as the original user. Try to check in the changes.

Figure 16-4. Linking two properties to the font size As you know, you can apply only a single data binding to the TextBlock.FontSize property. It makes sense to leave the TextBlock.FontSize property as is so that it binds directly to the slider: <TextBlock Margin="10" Text="Simple Text" Name="lblSampleText" FontSize="{Binding ElementName=sliderFontSize, Path=Value, Mode=TwoWay}" > </TextBlock> Although you can t add another binding to the FontSize property, you can bind the new control the TextBox to the TextBlock.FontSize property. Here s the markup you need: <TextBox Text="{Binding ElementName=lblSampleText, Path=FontSize, Mode=TwoWay}"> </TextBox> Now, whenever the TextBlock.FontSize property changes, the current value is inserted into the text box. Even better, you can edit the value in the text box to apply a specific size.

One other thing you ll probably notice is that the Value property returns a concatenation of all its child node Value properties, and not just its own Value. You might not think it helpful, but I ll show how you can use this feature as a shortcut in the next example. Figure 13-8 shows the console dump, created by ReadXPathNav.exe, of all the nodes and attributes that make up the monster DOM tree.

<TextBlock Text="Title Bar" Margin="1" Padding="5" MouseLeftButtonDown="titleBar_MouseLeftButtonDown"></TextBlock> In your event handler, you need only a single line of code: Private Sub titleBar_MouseLeftButtonDown(ByVal sender As Object, _ ByVal e As MouseButtonEventArgs) Me.DragMove() End Sub Now the window follows the mouse around the screen, until the user releases the mouse button.

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