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is true (the default), the TreeView performs a client-side callback to retrieve the nodes it needs from your event, without posting back the entire page. If PopulateNodesFromClient is false, or if it s true but the TreeView detects that the current browser doesn t appear to support client callbacks, the TreeView triggers a normal postback to get the same result. The only difference is that the entire page will be refreshed in the browser, generating a less seamless interface. (It also allows other page events to fire, such as control change events.)

29 has more information about how client callbacks work and how you can use them directly. However, the TreeView support is particularly nice because it hides the underlying model, allowing you to write an ordinary .NET event handler.

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public class StatefulLabel : Control { public virtual string Text { get { object text = ViewState["Text"]; if (text == null) return string.Empty; else return (string)text; } set { ViewState["Text"] = value; } } override protected void Render(HtmlTextWriter writer) { base.Render(writer); writer.RenderBeginTag(HtmlTextWriterTag.Span); writer.Write(Text); writer.RenderEndTag(); } } } The get method for the Text property uses some guard code to correctly deal with the ViewState collection if the key we are looking for is not available. If the return value is null, it returns an empty string. Returning an empty string is a good habit to get into, especially for control properties that are more complex than a primitive, such as a string or integer.

In the beginning of this chapter, you learned that ASP.NET has its own security mechanisms for handling authentication and authorization. You also looked at impersonation and how the security

You can use the populate-on-demand feature with the previous example. Instead of filling the whole tree when the page loads, you would begin by adding just the category nodes and setting them to populate on demand: protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { DataTable dtCategories = GetCategories(); // Loop through the category records. foreach (DataRow row in dtCategories.Rows) { TreeNode nodeCategory = new TreeNode( row["CategoryName"].ToString(), row["CategoryID"].ToString()); // Use the populate-on-demand feature for this // node's children. nodeCategory.PopulateOnDemand = true; // Make sure the node is collapsed at first, // so it's not populated immediately. nodeCategory.Collapse(); TreeView1.Nodes.Add(nodeCategory); } } } Now you need to react to the TreeNodePopulate event to fill a category when it s expanded. In this example, only the on-populate nodes are categories. However, if there were several types, you would check the TreeNode.Depth to determine what type of node is being expanded. protected void TreeView1_TreeNodePopulate(object sender, TreeNodeEventArgs e) { int categoryID = Int32.Parse(e.Node.Value); DataTable dtProducts = GetProducts(categoryID); // Loop through the product records. foreach (DataRow row in dtProducts.Rows) { // Use the constructor that requires just text // and a nondisplayed value.

TreeNode nodeProduct = new TreeNode( row["ProductName"].ToString(), row["ProductID"].ToString()); e.Node.ChildNodes.Add(nodeProduct); } } A given node is populated on-demand only once. After that, the values remain available on the client, and no callback is performed if the same node is collapsed and expanded.

Label Controls is a web form example that directly compares both the stateless and stateful controls in their use, or lack, of client-side state. The GUI layout setup is similar to the one we used for ClientState.aspx in the previous demonstration but changes the bottom portion of the web form layout to display the two label controls. Navigating to the web form URL directly renders the output shown in Figure 3-8. Listings 3-5 and 3-6 contain the .aspx page and codebehind class file for the Label Controls demonstration.

context of a process or thread dictates the security rights of an application. In this section, you ll learn how to configure authentication, authorization, and impersonation for an ASP.NET application. Unless otherwise noted, you should assume that configuration setting discussed in the following sections should be placed in Web.config located in the application s root folder.

The client-side callback feature can be tampered with, just like any posted data. For example, a malicious user could create a page that requests you to fill in an arbitrary CategoryID, even if you haven t added the category to the tree. If you are displaying a subset of data from a table that contains sensitive information, you should validate that the node is allowed before populating it.

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