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You can use the populate-on-demand feature with the previous example. Instead of filling the whole tree when the page loads, you would begin by adding just the category nodes and setting them to populate on demand: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) If (Not Page.IsPostBack) Then Dim dtCategories As DataTable = GetCategories() ' Loop through the category records. For Each row As DataRow In dtCategories.Rows Dim nodeCategory As New TreeNode( row("CategoryName").ToString(), row("CategoryID").ToString()) ' Use the populate-on-demand feature for this ' node's children. nodeCategory.PopulateOnDemand = True ' Make sure the node is collapsed at first, ' so it's not populated immediately. nodeCategory.Collapse() TreeView1.Nodes.Add(nodeCategory) Next row End If End Sub Now you need to react to the TreeNodePopulate event to fill a category when it s expanded. In this example, only the on-populate nodes are categories. However, if there were several types, you would check the TreeNode.Depth to determine what type of node is being expanded. Protected Sub TreeView1_TreeNodePopulate(ByVal sender As Object, ByVal e As TreeNodeEventArgs) Dim categoryID As Integer = Integer.Parse(e.Node.Value) Dim dtProducts As DataTable = GetProducts(categoryID) ' Loop through the product records. For Each row As DataRow In dtProducts.Rows ' Use the constructor that requires just text ' and a nondisplayed value. Dim nodeProduct As New TreeNode( row("ProductName").ToString(), row("ProductID").ToString()) e.Node.ChildNodes.Add(nodeProduct) Next row End Sub

Figure 16-5. A wizard with four steps Unlike the MultiView control, you can see only one step at a time in Visual Studio. To choose which step you re currently designing, select it from the smart tag, as shown in Figure 16-6. But be warned every time you do, Visual Studio changes the Wizard.ActiveStepIndex property to the step you choose. Make sure you set this back to 0 before you run your application so it starts at the first step.

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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".

A given node is populated on-demand only once. After that, the values remain available on the client, and no callback is performed if the same node is collapsed and expanded.

Note Remember, when you add controls to separate steps on a wizard, they are all instantiated and persisted in view state, regardless of the current step. If you need to slim down a complex wizard, you ll need to split it into separate pages, use the Server.Transfer() method to move from one page to the next, and tolerate a less elegant programming model.

This way, you ll show only the pages under the Dealer Home branch of the site map You can even make your life easier by breaking a single site map into separate files using the siteMapFile attribute, like this: <siteMap xmlns="http://schemasmicrosoftcom/AspNet/SiteMap-File-10" > <siteMapNode title="Root" description="Root" url="~/"> <siteMapNode siteMapFile="Dealerssitemap" /> <siteMapNode siteMapFile="Employeessitemap" /> </siteMapNode> </siteMap> Even with this technique, you re still limited to a single site map tree, and it always starts with the Websitemap file However, you can manage your site map more easily because you can factor some of its content into separate files..

The client-side callback feature can be tampered with, just like any posted data. For example, a malicious user could create a page that requests you to fill in an arbitrary CategoryID, even if you haven t added the category to the tree. If you are displaying a subset of data from a table that contains sensitive information, you should validate that the node is allowed before populating it.

You can write the code that underpins your wizard by responding to several events (as listed in Table 16-3). Table 16-3. Wizard Events

This technique is greatly limited because the XmlSiteMapProvider doesn t allow duplicate URLs. That means there s no way to reuse the same page in more than one branch of a site map. Although you can try to work around this problem by creating different URLs that are equivalent (for example, by adding extra query string parameters on the end), this raises more headaches. If these limitations won t work in your scenario, the best approach is to design your own site map provider.

The TreeView has a fine-grained style model that lets you completely control its appearance. Each style applies to a type of node. Styles are represented by the TreeNodeStyle class, which derives from the more conventional Style class. As with other rich controls, the styles give you options to set background and foreground colors, fonts, and borders. Additionally, the TreeNodeStyle class adds the node-specific style properties shown in Table 16-10. These properties deal with the node image and the spacing around a node. Table 16-10. TreeNodeStyle Added Properties

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