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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.

Here s an example connection string that sets a minimum pool size: string connectionString = "Data Source=localhost;Initial Catalog=Northwind;" + "Integrated Security=SSPI;Min Pool Size=10"; SqlConnection con = new SqlConnection(connectionString); // Get the connection from the pool (if it exists) // or create the pool with 10 connections (if it doesn't). con.Open(); // Return the connection to the pool. con.Close(); Some providers include methods for emptying out the connection pool. For example, with the SqlConnection you can call the static ClearPool() and ClearAllPools() methods. When calling

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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.

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.

ClearPool(), you supply a SqlConnection, and all the matching connections are removed. ClearAllPools() empties out every connection pool in the current application domain. (Technically, these methods don t close the connections. They just mark them as invalid so that they will time out and be closed during the regular connection cleanup a few minutes later.) This functionality is rarely used typically, the only case it s useful is if you know the pool is full of invalid connections (for example, as a result of restarting SQL Server) and you want to avoid an error.

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 matchingDescription As String = StringEmpty Protected Function GetDescriptionFromTitle(ByVal title As String) As String ' This assumes there's only one node with this title Dim node As SiteMapNode = SiteMapRootNode SearchNodes(node, title) Return matchingDescription End Function Private Sub SearchNodes(ByVal node As SiteMapNode, ByVal strTitle As String) If nodeTitle = strTitle Then matchingDescription = nodeDescription Return Else For Each child As SiteMapNode In nodeChildNodes ' Perform recursive search SearchNodes(child, strTitle) Next End If End Sub Now you can use the GetDescriptionFromTitle() method in a template: <asp:Menu ID="Menu1" runat="server" DataSourceID="SiteMapDataSource1"> <StaticItemTemplate> <%# Eval("Text") %><br /> <small> <%# GetDescriptionFromTitle(CType(ContainerDataItem,MenuItem)Text) %> </small> </StaticItemTemplate> <DynamicItemTemplate> <%# Eval("Text") %><br /> <small> <%# GetDescriptionFromTitle(CType(ContainerDataItem,MenuItem).

Figure 16-13. Showing navigation links in a GridView template 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 void cmdUp_Click(object sender, EventArgs e) { Response.Redirect(SiteMap.CurrentNode.ParentNode.Url); } Unfortunately, you have no way to bind to nodes further down the hierarchy, as the SiteMapDataSource control doesn t support the XPath syntax demonstrated in 12. However, you can embed a nested control and bind it programmatically, using the same technique that s described in 10 in the A Parent/Child View in a Single Table section.

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