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Figure 16-20. A menu with two static levels Interestingly, whether you fill the Menu class declaratively or programmatically, you can still use a template. From the template s point of view, you re always binding to a MenuItem object. That means your template always needs to extract the value for the item from the MenuItem.Text property, as shown here: <asp:Menu ID="Menu1" runat="server"> <StaticItemTemplate> <%# Eval("Text") %> </StaticItemTemplate> </asp:Menu> One reason you might want to use the template features of the Menu is to show multiple pieces of information from a data object. For example, you might want to show both the title and the description from the SiteMapNode for this item (rather than just the title). Unfortunately, that s not possible. The problem is that the Menu binds directly to the MenuItem object. The MenuItem object does expose a DataItem property, but by the time it s being added into the menu, that DataItem no longer has the reference to the SiteMapNode that was used to populate it. So, you re mostly out of luck. If you re really desperate, you can write a custom method in your class that looks up the SiteMapNode based on its URL. This is extra work that should be unnecessary, but it does get the job done of making the description information available to the menu item template. private string matchingDescription = ""; protected string GetDescriptionFromTitle(string title) { // This assumes there's only one node with this tile. SiteMapNode node = SiteMap.RootNode; SearchNodes(node, title); return matchingDescription; }

<br /> <asp:TextBox ID="NameTextBox" runat="server"></asp:TextBox><br /> <br /> <asp:Button ID="SetLabelButton" runat="server" Text="Set Labels" OnClick="SetLabelButton_Click"> </asp:Button>  <asp:Button ID="SubmitPageButton" runat="server" Text="Submit Page"></asp:Button><br /> <br /> <h3> StatelessLabel</h3> <apress:StatelessLabel ID="StatelessLabel1" Text="StatelessLabel" runat="server" /> <br /> <h3> StatefulLabel</h3> <apress:StatefulLabel ID="StatefulLabel1" Text="StatefulLabel" runat="server" /> </asp:Content> Listing 3-6. The LabelControls Web Form Code-Behind Class File using System; namespace ControlsBook2Web.Ch03 { public partial class LabelControls : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void SetLabelButton_Click(object sender, EventArgs e) { StatelessLabel1.Text = "Set by " + NameTextBox.Text; StatefulLabel1.Text = "Set by " + NameTextBox.Text; } } }

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private void SearchNodes(SiteMapNode node, string title) { if (node.Title == title) { matchingDescription = node.Description; return; } else { foreach (SiteMapNode child in node.ChildNodes) { // Perform recursive search. SearchNodes(child, title); } } } Now you can use the GetDescriptionFromTitle() method in a template: <asp:Menu ID="Menu1" runat="server" DataSourceID="SiteMapDataSource1"> <StaticItemTemplate> <%# Eval("Text") %><br /> <small> <%# GetDescriptionFromTitle(((MenuItem)Container.DataItem).Text) %> </small> </StaticItemTemplate> <DynamicItemTemplate> <%# Eval("Text") %><br /> <small> <%# GetDescriptionFromTitle(((MenuItem)Container.DataItem).Text) %> </small> </DynamicItemTemplate> </asp:Menu> Finally, you can declare data bindings for the Menu control that specifically map out what property in the bound object should be used for the MenuItem text. This isn t much help if you want to display both the title and description, because it accepts only one field. However, it s fairly easy to show the title as the text and the description as the tooltip text: <asp:Menu ID="Menu1" runat="server" DataSourceID="SiteMapDataSource1"> <DataBindings> <asp:MenuItemBinding DataMember="SiteMapNode" TextField="Title" ToolTipField="Description" /> </DataBindings> </asp:Menu>

For a connection to exist between two Web Parts, both of the Web Parts must be present and active on the same page (they may be hidden but cannot be closed) Also understand that a Provider Web Part can participate in many connections, but a Consumer Web Part can only participate in one This ensures that data is not sent to the Consumer twice, which could result in an accidental overwrite..

Summary

In this chapter you explored a variety of navigation features. You started with the multipane MultiView and Wizard controls. You then delved into the new navigation model and learned how to define site maps, bind the navigation data, and extend the site map provider infrastructure. Finally, you considered two rich controls that are especially suited for navigation data, the TreeView and Menu.

Forms Authentication always uses cookies. If the browser does not support cookies, or cookies have been disabled, the user isn t allowed to access the application. Forms Authentication always stores authentication data in the query string and does not attempt to use cookies. This is good if your target users normally have cookies disabled or are using older browsers that don t support cookies.

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