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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. 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 />

NET ISAPI extension Now let s see how this affects access to those files A user with manager-level access logs in to the application ASPNET authenticates the user and creates a ticket identifying the user as a member of the Manager role The user then requests the ViewReportaspx page The ASPNET authorization module knows that only users in the Manager role may request files in the Reports folder, so it checks the role information associated with the user Because the user is in the Manager role, ASPNET authorizes the request and displays a list of reports to the user The user clicks on a report to open it The request for the Excel file goes to IIS, but it isn t routed to ASPNET.

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

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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.

State information placed inside of the ViewState collection is kept separate for each control as well as from the web form itself. During page processing, ViewState data is converted into a hashed, compressed, and encoded blob that is streamed to the client as a hidden form field named __VIEWSTATE.

Because IIS is using anonymous access, IIS checks the NTFS permissions on the file to determine if the anonymous user account has access to the file It does not The user is denied access to the file even though the user is logged in as a Manager in the ASPNET application A worse scenario occurs if the anonymous user account has access to the files because IIS always serves the file, even to users who should not have access You can avoid this issue by creating application mappings for file types you want managed by ASPNET security This forces ASPNET to process the requests and enforce security constraints on the requested file However, allowing ASPNET to handle files will hinder performance because of the extra steps involved in passing the request off to ASPNET.

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