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<Ellipse Fill="Green" Width="100" Height="50" /> <TextBlock Text="Text and graphics" FontSize="45" /> <Ellipse Fill="Green" Width="100" Height="50" /> </StackPanel> <Button Content="Button" /> <TextBox Text="Editable" /> </ListBox>

That is, an attacker can simply use his browser to navigate our web application to a page containing such a form, and then extract the value from the hidden field in the form He now has a copy of a token that our application will consider valid under this validation scheme in security engineering parlance, the attacker was able to use our own application as an oracle to obtain a valid token without having to know the secret key that is used to generate the tokens.

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Figure 20-12 shows the results. As well as showing the content we provided, the ListBox provides the usual visual responses to mouse input the item underneath the mouse has a slightly darker background than the item below to indicate that it can be selected. The item at the bottom is darker still because it is currently selected. These highlights come from the item container all items controls generate an item container for each child. A ListBox will generate ListBoxItem containers; TreeView generates TreeViewItem objects, and so on.

Most of the code in this view is generated automatically by the PRE. If you type code here and later decide to return to the simple view, a dialog box will warn you that all of your added code will be lost and the block will return to the original generated code. Looking at Listing 7-6, you should recognize the getItems operation. It is being called from the variable named rss representing the RSSClass that was defined in the <block class="RSSClass"> tag in the RSS block definition (refer to Listing 7-1).

Sometimes it s useful to bring your own container, because you may need to do more than populate it with a single piece of content. For example, when building a tree view, you don t just need to set the node caption; you may also want to add child nodes. Example 20-18 explicitly creates TreeViewItem containers to define a tree structure.

<ctl:TreeView> <ctl:TreeViewItem> <ctl:TreeViewItem.Header> <StackPanel Orientation="Horizontal"> <Ellipse Fill="Green" Width="100" Height="50" /> <TextBlock Text="Content" FontSize="45" /> <Ellipse Fill="Green" Width="100" Height="50" /> </StackPanel> </ctl:TreeViewItem.Header> <ctl:TreeViewItem Header="Child A" /> <ctl:TreeViewItem Header="Child B" /> </ctl:TreeViewItem>

<ctl:TreeViewItem> <ctl:TreeViewItem.Header> <Button Content="Button" /> </ctl:TreeViewItem.Header> <ctl:TreeViewItem Header="Child 1" /> <ctl:TreeViewItem Header="Child 2" /> <ctl:TreeViewItem> <ctl:TreeViewItem.Header> <Button Content="Child 3" /> </ctl:TreeViewItem.Header> </ctl:TreeViewItem> </ctl:TreeViewItem> <ctl:TreeViewItem> <ctl:TreeViewItem.Header> <TextBox Text="Editable" /> </ctl:TreeViewItem.Header> </ctl:TreeViewItem> </ctl:TreeView>

Notice the unusual ctl: prefix see the sidebar on the next page for an explanation. As you can see from Figure 20-13, each Header property value has ended up as the label for a single node in the tree. The parent-child relationship of the nodes is determined by the nesting of the TreeViewItem elements in the Xaml.

How can we prevent this further attack The key observation is that our application not only needs to be able to tell if it is receiving a request with any action token that it had previously sent to some browser, but rather needs to check that an incoming request includes a token value that had been previously sent to the same browser! Since (due to the same-origin policy), third-party pages in a different domain cannot inspect or set cookies in our domain, we can reliably distinguish between browser instances based on a cookie we have set at an earlier time We can thus tie the validity of an action token to a particular browser instance by binding the value of the action token to the value of a suitable cookie.

Example 20-18 uses the TreeView control and its associated TreeViewItem container. These are not built into the main Silverlight plug-in. They are provided as part of the Silverlight SDK in a separate DLL called System.Windows.Controls, which ends up getting built into your Silverlight application. Unlike normal .NET applications, Silverlight applications are packaged into a ZIP file (usually given a file extension of .xap, which is pronounced zap ) so that multiple components and resources can be bundled into a single application. This file must include any control libraries either those provided by Microsoft or third parties, or ones you ve written. To build a DLL into your Silverlight application package, you just add a reference to the DLL in Visual Studio in the usual way. When using controls from libraries, you need to let the Xaml compiler know where it s supposed to find the control. So for Example 20-18 to work, something extra needs to go in the Xaml. The root element would contain an extra XML namespace declaration:

xmlns:ctl="clr-namespace:System.Windows.Controls; assembly=System.Windows.Controls"

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