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In the site maps you ve seen so far, the only information that s provided for a node is the title, description, and URL. This is the bare minimum of information that you ll want to use. However, the schema for the XML site map is open, which means you re free to insert custom attributes with your own data. You might want to insert additional node data for a number of reasons. This additional information might be descriptive information that you intend to display or contextual information that describes how the link should work. For example, you could add attributes that specify a target frame or indicate that a link should be opened in a pop-up window. The only catch is that it s up to you to act on the information later. In other words, you need to configure your user interface so it uses this extra information.

For example, the following code shows a site map that uses a target attribute to indicate the frame where the link should be opened. This technique is useful if you re using frames-based navigation (rather than a master page), as described in 29. In this example, one link is set with a target of _blank so it will open in a new (pop-up) browser window. <siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" > <siteMapNode title="Home" description="Root" url="~/Default.aspx"> <siteMapNode title="Products" description="Our products" url="~/Products.aspx" target="_blank" /> ... </siteMapNode> </siteMap> Now in your code, you have several options. If you re using a template in your navigation control, you can bind directly to the new attribute. Here s an example with the GridView from the previous section: <ItemTemplate> <a href='<%# Eval("Url") %>' target='<%# Eval("[target]") %>'><%# Eval("Title") %></a> <br /> <%# Eval("Description") %> </ItemTemplate> The one trick in this example is that you need to use square brackets around the attribute name to indicate that the value is being looked up (by name) in the data item s indexer. If your navigation control doesn t support templates (or you don t want to create one), you ll need to find another approach. Both the TreeView and Menu classes expose an event that fires when an individual item is bound (TreeNodeDataBound and MenuItemDataBound). You can then customize the current item. To apply the new target, you use this code: protected void TreeView1_TreeNodeDataBound(object sender, TreeNodeEventArgs e) { e.Node.Target = ((SiteMapNode)e.Node.DataItem)["target"]; } Notice that you can t retrieve the custom attribute from a strongly typed property. Instead, you retrieve it by name using the SiteMapNode indexer.

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To create a new application mapping, open your application s properties window Click on the Directory tab (this will be Home Directory, Virtual Directory, or simply Directory depending upon what tpe of directory it is) Click on the Configuration button in the bottomright section of the window (shown in Figure 12-15)..

Tip To see what ViewState looks like on the client side, simply load one of the book s sample web forms (you can find them on the book s page on the Apress web site at http://www.apress.com) and select View Source in your web browser. You will find a hidden form field named __VIEWSTATE and its value.

You can also create a custom SiteMapProvider that returns instances of a custom SiteMapNode-derived class. However, a significant amount of extra code is required, and as a result it s often not worth the trouble.

To really change how the ASP.NET navigation model works, you need to create your own site map provider. You might choose to create a custom site map provider for several reasons: You need to store site map information in a different data source (such as a relational database). You need to store site map information with a different schema from the XML format expected by ASP.NET. This is most likely if you have an existing system in place for storing site maps.

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