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You can switch your program into break mode at any point by clicking the pause button in the toolbar or by selecting Debug Break All.

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 Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) lblHead.Text = SiteMap.CurrentNode.Title lblDescription.Text = SiteMap.CurrentNode.Description End Sub 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 Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) If SiteMap.CurrentNode.NextSibling IsNot Nothing Then lnkNext.NavigateUrl = SiteMap.CurrentNode.NextSibling.Url lnkNext.Visible = True

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protected void Page_Load(Object sender, EventArgs e) { // Acquire exclusive access ApplicationLock(); int count = (int)Application["HitCounterForOrderPage"]; count++; Application["HitCounterForOrderPage"] = count; // Release exclusive access ApplicationUnlock(); lblCounterText = countToString(); } Unfortunately, all other clients requesting the page will now be stalled until the Application collection is released This can drastically reduce performance Generally, frequently modified values are poor candidates for application state In fact, application state is rarely used in the NET world because its two most common uses have been replaced by easier, more efficient methods: In the past, application state was used to store application-wide constants, such as a database connection string As you saw in 5, this type of constant can now be stored in the webconfig file, which is generally more flexible because you can change it easily without needing to hunt through web-page code or recompile your application.

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

Choose Debug Windows Breakpoints to see a window that lists all the breakpoints in your current project. The Breakpoints window provides a hit count, showing you the number of times a breakpoint has been encountered (see Figure 2-25). You can jump to the corresponding location in code by double-clicking a breakpoint. You can also use the Breakpoints window to disable a breakpoint without removing it. That allows you to keep a breakpoint to use in testing later, without leaving it active. Breakpoints are automatically saved with the hidden solution file described earlier.

Application state can also be used to store frequently used information that is timeconsuming to create, such as a full product catalog that requires a database lookup However, using application state to store this kind of information raises all sorts of problems about how to check if the data is valid and how to replace it when needed It can also hamper performance if the product catalog is too large A similar but much more sensible approach is to store frequently used information in the ASPNET cache Many uses of application state can be replaced more efficiently with caching Application state information is always stored in process This means you can use any NET data types However, it also introduces the same two limitations that affect in-process session state.

The only limitation in this example is that it shows links nested underneath the current page. It doesn t provide links to travel back up. You would need to add other controls to provide this functionality. You can use the SiteMapPath control along with the GridView, or you can use the SiteMap API. For example, you can use a LinkButton that, when clicked, runs this code to go up one level in the hierarchy: Protected Sub cmdUp_Click(ByVal sender As Object, ByVal e As EventArgs) Response.Redirect(SiteMap.CurrentNode.ParentNode.Url) End Sub

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