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Even when you disable view state for the entire page, you ll still see the hidden view state tag with a small amount of information. That s because ASP.NET always stores the control hierarchy for the page at a minimum, even if view state is disabled. There s no way to remove this last little fragment of data.

Figure 16-7. Template regions in the Wizard control Table 16-5 shows the full list of templates. Table 16-5. Wizard Templates

To see this in action, consider the following code, which configures two labels on a page to show the heading and description information retrieved from the current node: protected void Page_Load(object sender, EventArgs e) { lblHead.Text = SiteMap.CurrentNode.Title; lblDescription.Text = SiteMap.CurrentNode.Description; } The next example is a little more ambitious. It implements the previous/next links, which allow the user to traverse an entire set of subnodes. The code checks for the existence of sibling nodes, and if there aren t any in the required position, it simply hides the links. protected void Page_Load(object sender, EventArgs e) { if (SiteMap.CurrentNode.NextSibling != null) { lnkNext.NavigateUrl = SiteMap.CurrentNode.NextSibling.Url; lnkNext.Visible = true; } else { lnkNext.Visible = false; } }

HeaderTemplate SideBarTemplate StartNavigationTemplate StepNavigationTemplate FinishNavigationTemplate

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In some controls, disabling view state may break a feature on which you rely Although the situation has improved with the creation of control state (a privileged section of view state used by the control, which you ll learn about in 27), some problems still remain This is particularly the case with existing controls, which sometimes can t be updated to use control state without introducing behavior changes that could break existing ASP NET 1x pages One example is how list controls such as ListBox and DropDownList track selection Imagine you create a page where you need to fill a drop-down list with hundreds of entries If the list isn t expensive to create (for example, if you re retrieving it directly from memory or the cache), you might choose to disable view state for the list control and rebuild the list at the beginning of each postback.

The TreeView and MenuView are two navigation controls that show hierarchical navigation information. (Both the TreeView and MenuView are described in more detail later in this chapter.) However, you aren t limited to these two controls you can also use any ASP .NET control that supports data binding, from the ListBox to the GridView. For example, you can bind the navigation information to a template in a rich data control and use data binding expression to extract the title, description, and URL information. Here s an example with a GridView: <asp:GridView ID="listNavLinks" runat="server" DataSourceID="SiteMapDataSource1" AutoGenerateColumns="false" ShowHeader="False" BackColor="Linen" CellPadding="5"> <Columns> <asp:TemplateField> <ItemTemplate> <a href='<%# Eval("Url") %>'><%# Eval("Title") %></a> <br />

Defines the content of the header region Defines the sidebar, which typically includes navigation links for each step Defines the navigation buttons for the first step (when StepType is Start) Defines the navigation buttons for intermediate steps (when StepType is Step) Defines the navigation buttons for the final step (when StepType is Finish)

Here s an example that simply fills a list with numbers: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) For i As Integer = 0 To 999 lstBigItemsAdd(iToString()) Next End Sub The problem this causes is that once you disable view state, you ensure that the user s list selection is lost every time the page is posted back That means you won t be able to retrieve any information from the SelectedIndex or SelectedItem properties Similarly, the SelectedIndexChanged won t fire You have one way to remedy this problem Although the selection information is lost, the user s choice is actually still maintained in the RequestForms collection (a collection of posted values that s present for backward compatibility with ASP pages).

<%# Eval("Description") %> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> Figure 16-13 shows the result.

For example, here s a header template that uses a data binding expression to show the title of the current step: <asp:Wizard ID="Wizard1" runat="server" ...> <WizardSteps> ... </WizardSteps> <HeaderTemplate> <i>Header Template</i> <b><%= Wizard1.ActiveStep.Title %></b> <br /><br /> </HeaderTemplate> </asp:Wizard>

You can look up the selected value using the control name, and you can use code such as this to reset the proper selected index: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) For i As Integer = 0 To 999 lstBigItemsAdd(iToString()) Next If PageIsPostBack Then lstBigSelectedItemText = RequestForm("lstBig") End If End Sub.

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