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The TreeView is the most impressive new control in ASP .NET 2.0. Not only does it allow you to render rich tree views, it also supports filling portions of the tree on demand (and without refreshing the entire page). But most important, it supports a wide range of styles that can transform its appearance. By setting just a few basic properties, you can change the TreeView from a help topic index to a file and folder directory listing. In fact, the TreeView doesn t have to be rendered as a tree at all it can also tackle nonindented hierarchical data such as a table of contents with the application of just a few style settings. You ve already seen two basic TreeView scenarios. In 12, you used a TreeView to display bound XML data. In this chapter, you used a TreeView to display site map data. Both of these examples used the ability of the TreeView to bind to hierarchical data sources. But you can also fill a TreeView by binding to an ordinary data source (in which case you ll get only a single level of nodes) or by creating the nodes yourself, either programmatically or through the .aspx declaration. The latter option is the simplest. For example, by adding <asp:TreeNode> tags to the <Nodes> section of a TreeView control, you can create several nodes:

<asp:TreeView runat="server"> <Nodes> <asp:TreeNode Text="Products"> <asp:TreeNode Text="Hardware"/> </asp:TreeNode> <asp:TreeNode Text="Services"/> </Nodes> </asp:TreeView> And here s how you can add a TreeNode programmatically when the page loads: TreeNode newNode = new TreeNode("Software"); // Add as a child of the first root node // (the Products node in the previous example). TreeView1.Nodes[0].ChildNodes.Add(newNode); When the TreeView is first displayed, all the nodes are shown. You can control this behavior by setting the TreeView.ExpandDepth property. For example, if ExpandDepth is 2, only the first three levels are shown (level 0, level 1, and level 2). You can also programmatically collapse and expand nodes by setting the TreeNode.Expanded property to true or false. This just scratches the surface of how a TreeView works. To get the most out of the TreeView, you need to understand how to customize several other details for a TreeNode.

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Logging Exceptions for Analysis: Demonstrates how to log application exceptions as they occur in your application..

// put the name in the hidden variable HiddenNameValue = name; // put the name in ViewState ViewState["viewstatename"] = name; } private void GetClientState() { // check the cookiename Cookie CookieLabelText = ""; if (RequestCookies["cookiename"] != null) CookieLabelText = RequestCookies["cookiename"]Value; // check the URL for urlname variable URLLabelText = ""; if (RequestQueryString["urlname"] != null) URLLabelText = RequestParams["urlname"]; // check the form data for hiddenname variable // Must use UniqueID to get correct HTML Form name HiddenLabelText = ""; if (ContextRequestForm[HiddenNameUniqueID] != null) HiddenLabelText = RequestForm[HiddenNameUniqueID]; // check the Viewstate for the viewstatename variable ViewStateLabelText = ""; if (ViewState["viewstatename"] != null) ViewStateLabelText = ViewState["viewstatename"]ToString(); } } } Clicking the Set State button submits the page via postback to ASP.

This step is strongly discouraged. It s much better to configure multiple servers to use the same key, thereby removing any problem. 5 describes how to do this.

Even when you use hash codes, the view state data will still be readable. To prevent users from getting any view state information, you can enable view state encryption. You can turn on encryption for an individual page using the ViewStateEncryptionMode property of the Page directive: <%@Page ViewStateEncryptionMode="Always"> Or you can set the same attribute in the web.config configuration file: <pages viewStateEncryptionMode="Always"> Either way, this enforces encryption. You have three choices for your view state encryption setting always encrypt (Always), never encrypt (Never), or encrypt only if a control specifically requests if (Auto). The default is Auto, which means a control must call the Page.RegisterRequiresViewStateEncryption() method to request encryption. If no control calls this method to indicate it has sensitive information, the view state is not encrypted, thereby saving the encryption overhead.

Figure 12-15. Properties window showing the Configuration button This displays the Application Configuration dialog box. Select the Mappings tab if it isn t already selected. You can see a listing of extensions, their respective ISAPI extension mappings in this tab, and buttons allowing you to add, edit, or delete mappings (shown in Figure 12-16).

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