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Figure 16-11. A site map without the root node This example shows how you can skip the root node. Another option you have is to show just a portion of the complete site map, starting from the current node. For example, you might use a control such as the TreeView to show everything in the hierarchy starting from the current node. If the user wants to move up a level, they could use another control (such as a SiteMapPath). To implement this design, simply set the SiteMapDataSource.StartFromCurrentNode property to true. The SiteMapPath will still show the complete hierarchy, allowing the user to move up to a higher-level page. However, other bound controls will show only pages beneath the current page, allowing the user to move down the hierarchy. You still have the choice of whether to use ShowStartingNode, but now it determines whether you show the current node (because that s the starting point for the navigation tree). Figure 16-12 shows an example where both StartFromCurrentNode and ShowStartingNode are true. The current page is Software.aspx. The SiteMapPath shows higher-level pages, and the TreeView shows the nodes underneath the Software.aspx node.

As mentioned in the previous section, the ViewState server control state management technique builds on the hidden form field client-side method, taking advantage of its well documented benefits while minimizing its potential drawbacks. ViewState addresses hidden form variable limitations by providing built-in data management, compression, encoding, and tamper resistance, so web developers and control builders can focus on the application requirements and business logic.

Figure 16-12. Binding to child nodes only For this technique to work, ASP.NET must be able to find a page in the Web.sitemap file that matches the current URL. Otherwise, it won t know where the current position is, and it won t provide any navigation information to the bound controls.

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idea of using reversible encryption You should use Digest Authentication when you don t need to use delegation, and when compatibility is a concern but Basic Authentication is too much of a security risk (for example, you can t secure it with SSL) Integrated Windows Authentication Integrated Windows Authentication is a very secure challenge/response style authentication mechanism that offers Internet Explorer users a seamless login experience Instead of prompting the user for credentials, Internet Explorer uses the logged-in user s credentials to attempt authentication If authentication succeeds, the user never sees a login screen If authentication fails, Internet Explorer prompts the user for a different set of credentials For authentication to be seamless, both the client and server must have access to the same Active Directory or have identical accounts defined on both machines (that is, accounts with the same username and same password).

The SiteMapDataSource has two more properties that can help you configure the navigation tree: StartingNodeOffset and StartingNodeUrl StartingNodeUrl is the easiest to understand it takes the URL of the node that should be the first node in the tree This value must match the url attribute in the Websitemap file exactly For example, if you specify a StartingNodeUrl of "~/homeaspx", then the first node in the tree is the Home node, and you will see only nodes underneath that node The StartingNodeUrl property is particularly useful if you want to vary between a small number of different site maps (say, fewer than ten) The ideal solution is to define multiple site map files and bind to the one you want to use Unfortunately, the default XmlSiteMapProvider supports only a single site map file, so you need to find a different mechanism.

In this case, the solution is to separate the different site maps into distinct branches of the Websitemap file For example, imagine you want to have a dealer section and an employee section on your website You might split this into two different structures and define them both under different branches in the same file, like this: <siteMap xmlns="http://schemasmicrosoftcom/AspNet/SiteMap-File-10" > <siteMapNode title="Root" description="Root" url="~/"> <siteMapNode title="Dealer Home" description="Home" url="~/defaultaspx"> .. </siteMapNode> <siteMapNode title="Employee Home" description="Home" url="~/default_empaspx"> .. </siteMapNode> </siteMapNode> </siteMap> Now, to bind the menu to the dealer view, you set the StartingNodeUrl property to "~/defaultaspx" You can do this programmatically or, more likely, by creating an entirely different master page and implementing it in all your dealer pages In your employee pages, you set StartingNodeUrl property to "~/default_empaspx".

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