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If your website has more than a handful of pages, you ll probably need some sort of navigation system to let the user move one page to the next. As you saw in 15, you can use master pages to define a template for your site that includes a navigation bar. However, it s still up to you to fill this navigation bar with content. Obviously, you can use the ASP.NET toolkit of controls to implement almost any navigation system, but it still requires you to perform all the hard work. Fortunately, ASP.NET adds a new set of navigation features that you can use to dramatically simplify the task. As with all the best ASP.NET features, ASP.NET navigation is flexible, configurable, and pluggable. It consists of three components: A way to define the navigational structure of your website. This part is the XML site map, which is (by default) stored in a file. A convenient way to parse the site map file and convert its information into a suitable object model. This part is performed by the SiteMapDataSource control and the XmlSiteMapProvider.

As described in earlier chapters, view state information is stored in a single Base64-encoded string that looks like this: <input type="hidden" name="__VIEWSTATE" value="dDw3NDg2NTI5MDg7Oz4="/>

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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.

A way to use the site map information to display the user s current position and give the user the ability to easily move from one place to another. This part is provided through the controls you bind to the SiteMapDataSource control, which can include breadcrumb links, lists, menus, and trees. You can customize or extend each of these ingredients separately. For example, if you want to change the appearance of your navigation controls, you simply need to bind different controls to the SiteMapDataSource. On the other hand, if you want to read a different format of site map information or read it from a different location, you need to change your site map provider. Figure 16-8 shows how these pieces fit together.

Because this value isn t formatted as clear text, many ASP.NET programmers assume that their view state data is encrypted. It isn t. A clever hacker could reverse-engineer this string and examine your view state data in a matter of seconds, as demonstrated in 3. If you want to make view state secure, you have two choices. First, you can make sure that the view state information is tamper-proof by using a hash code. You do this by adding the EnableViewStateMAC attribute to the Page directive in your .aspx file, as shown here: <%@ Page EnableViewStateMAC="true" %> A hash code is a cryptographically strong checksum. Essentially, ASP.NET calculates this checksum based on the current view state content and adds it to the hidden input field when it returns the page. When the page is posted back, ASP .NET recalculates the checksum and ensures that it matches. If a malicious user changes the view state data, ASP .NET will be able to detect the change, and it will reject the postback. Hash codes are enabled by default, so if you want this functionality, you don t need to take any extra steps. Occasionally, developers choose to disable this feature to prevent problems in a web farm where different servers have different keys. (The problem occurs if the page is posted back and handled by a new server, which won t be able to verify the view state information.) To disable hash codes, you can use the EnableViewStateMac attribute of the <pages> element in the web.config or machine.config file, as shown here: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.web> <pages enableViewStateMac="False" /> ... </system.web> </configuration>

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