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One unusual detail about the TreeNode is that it can be in one of two modes In selection mode, clicking the node posts back the page and raises the TreeViewSelectedNodeChanged event This is the default mode for all nodes In navigation mode, clicking a node navigates to a new page, and the SelectedNodeChanged event is not raised The TreeNode is placed in navigation mode as soon as you set the NavigateUrl property to anything other than an empty string A TreeNode that s bound to site map data is in navigational mode, because each site map node supplies URL information The next example fills a TreeView with the results of a database query You want to use the TreeView s ability to show hierarchical data to create a master-details list Because ASP.

All parts of the path except the root and current node. The node representing the current page. The node representing the root. If the root node is the same as the current node, the current node template or styles are used. The separator between each node.

Of course, not all uses of the MultiView need to involve data binding. The perfect scenario for the MultiView is an extended set of input controls for example, an online survey form that s split into separate views just to spare the user a lot of scrolling. This example works well with the MultiView because at the end when the survey is complete, you can read all the data from the controls of every view.

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NET doesn t include any data source control that can query a database and expose the results as a hierarchical data source, you can t use data binding Instead, you need to programmatically query the table and create the TreeNode structure by hand Here s the code that implements this approach: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) If (Not PageIsPostBack) Then Dim ds As DataSet = GetProductsAndCategories() ' Loop through the category records For Each row As DataRow In dsTables("Categories")Rows ' Use the constructor that requires just text ' and a nondisplayed value Dim nodeCategory As New TreeNode(row("CategoryName")ToString(), row("CategoryID")ToString()) TreeView1NodesAdd(nodeCategory) ' Get the children (products) for this parent (category) Dim childRows As DataRow() = rowGetChildRows(dsRelations(0)) ' Loop through all the products in this category For Each childRow As DataRow In childRows Dim nodeProduct As New TreeNode( childRow("ProductName").

For example, the following SiteMapPath uses an arrow image as a separator and a fixed string of bold text for the root node. The final part of the path, which represents the current page, is italicized. <asp:SiteMapPath ID="SiteMapPath1" runat="server"> <PathSeparatorTemplate> <asp:Image ID="Image1" ImageUrl="~/images/arrow.jpg" runat="server" GenerateEmptyAlternateText="True" /> </PathSeparatorTemplate> <RootNodeTemplate> <b>Root</b> </RootNodeTemplate> <CurrentNodeTemplate> <i><asp:Label ID="Label1" runat="server" Text='<%# Eval("title") %>'> </asp:Label></i> </CurrentNodeTemplate> </asp:SiteMapPath> Notice how the CurrentNodeTemplate uses a data binding expression to bind to the title property of the current node. You can also get the url and description attributes that you declared in the site map file in the same way.

The Wizard control is a more glamorous version of the MultiView control. It also supports showing one of several views at a time, but it includes a fair bit of built-in yet customizable behavior, including navigation buttons, a sidebar with step links, styles, and templates. Usually, wizards represent a single task, and the user moves linearly through them, moving from the current step to the one immediately following it (or the one immediately preceding it in the case of a correction). The ASP.NET Wizard control also supports nonlinear navigation, which means it allows you to decide to ignore a step based on the information the user supplies. By default, the Wizard control supplies navigation buttons and a sidebar with links for each step on the left. You can hide the sidebar by setting the Wizard.DisplaySideBar property to false. Usually, you ll take this step if you want to enforce strict step-by-step navigation and prevent the user from jumping out of sequence. You supply the content for each step using any HTML or ASP .NET controls. Figure 16-4 shows the region where you can add content to an out-of-the-box Wizard instance.

ToString(), childRow("ProductID")ToString()) nodeCategoryChildNodesAdd(nodeProduct) Next childRow ' Keep all categories collapsed (initially) nodeCategoryCollapse() Next row End If End Sub Now when a node is clicked, you can handle the SelectedNodeChanged event to show the node information: Protected Sub TreeView1_SelectedNodeChanged(ByVal sender As Object, ByVal e As EventArgs) If TreeView1SelectedNode Is Nothing Then Return End If If TreeView1SelectedNodeDepth = 0 Then lblInfoText = "You selected Category ID: " ElseIf TreeView1SelectedNodeDepth = 1 Then lblInfoText = "You selected Product ID: " End If lblInfoText &= TreeView1SelectedNodeValue End Sub.

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