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SelectedNodeChanged event is not raised. The TreeNode is placed in navigation mode as soon as you set the NavigateUrl property to anything other than an empty string. A TreeNode that s bound to site map data is in navigational mode, because each site map node supplies URL information. The next example fills a TreeView with the results of a database query. You want to use the TreeView s ability to show hierarchical data to create a master-details list. Because ASP.NET doesn t include any data source control that can query a database and expose the results as a hierarchical data source, you can t use data binding. Instead, you need to programmatically query the table and create the TreeNode structure by hand. Here s the code that implements this approach: protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { DataSet ds = GetProductsAndCategories(); // Loop through the category records. foreach (DataRow row in ds.Tables["Categories"].Rows) { // Use the constructor that requires just text // and a nondisplayed value. TreeNode nodeCategory = new TreeNode( row["CategoryName"].ToString(), row["CategoryID"].ToString()); TreeView1.Nodes.Add(nodeCategory); // Get the children (products) for this parent (category). DataRow[] childRows = row.GetChildRows(ds.Relations[0]); // Loop through all the products in this category. foreach (DataRow childRow in childRows) { TreeNode nodeProduct = new TreeNode( childRow["ProductName"].ToString(), childRow["ProductID"].ToString()); nodeCategory.ChildNodes.Add(nodeProduct); } // Keep all categories collapsed (initially). nodeCategory.Collapse(); } } } Now when a node is clicked, you can handle the SelectedNodeChanged event to show the node information: protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e) { if (TreeView1.SelectedNode == null) return; if (TreeView1.SelectedNode.Depth == 0) { lblInfo.Text = "You selected Category ID: "; } else if (TreeView1.SelectedNode.Depth == 1) {

Figure 12-20. Advanced Security Settings dialog box. Notice the Inherit from parent... check box near the bottom of the screen.

lblInfo.Text = "You selected Product ID: "; } lblInfo.Text += TreeView1.SelectedNode.Value; } Figure 16-15 shows the result.

Figure 16-15. Filling a TreeView with database data A few options exist to simplify the page code in this example. One option is to bind to XML data instead of relational data. Seeing as SQL Server 2000 and later have the ability to perform XML queries with FOR XML, you could retrieve the data shaped in a specific XML markup and then bind it through the XmlDataSource control. The only trick is that because the XmlDataSource assumes you ll be binding to a file, you need to set the Data property by hand with the XML extracted from the database.

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Tip Another useful feature of the Advanced Security Settings dialog box is the Effective Permissions tab. This allows you to specify an account and see a permission listing for that account that includes permissions from groups with which the account is associated. This can be helpful when trying to determine why a particular account can t access a specific resource.

To spiff up things and take advantage of ViewState, the second label control, StatefulLabel, has a different mechanism for storing the information passed to the Text property. It uses the ViewState collection to read/write the property information in its get and set methods. Listing 3-4 contains the source code for the StatefulLabel class file. Listing 3-4. The StatefulLabel Class File using System; using System.Web.UI; using System.ComponentModel; namespace ControlsBook2Lib.Ch03 { [ToolboxData("<{0}:statefullabel runat=server></{0}:statefullabel>"), DefaultProperty("Text")]

If you have an extremely large amount of data to display in a TreeView, you probably don t want to fill it in all at once. Not only will that increase the time taken to process the initial request for the page, it will also dramatically increase the size of the page and the view state. Fortunately, the TreeView includes a populate-on-demand feature that makes it easy to fill in branches of the tree as they are expanded. Even better, you can use populate-on-demand on selected portions of the tree, as you see fit. To use populate-on-demand, you set the PopulateOnDemand property to true for any TreeNode that has content you want to fill in at the last minute. When the user expands this branch, the TreeView will fire a TreeNodePopulate event, which you can use to add the next level of nodes. If you want, this level of nodes can contain another level of nodes that are populated on demand. Although the programming model remains fixed, the TreeView actually supports two techniques for filling in the on-demand nodes. When the TreeView.PopulateNodesFromClient property

Files and folders can have both inherited and explicitly defined permissions. So, you can inherit a base set of permissions from a parent folder and then add additional permissions to specific files and folders as you so choose. Another interesting aspect of NTFS permissions is that you don t need access to a parent folder to have access to child folders or files. For example, let s say you want to access a file named C:\FolderA\FolderB\FolderC\Report.xls. Let s say you ve been denied read and write access to FolderA, FolderB, and FolderC, but have been allowed read and write access to Report.xls. You can actually open Report.xls as long as you know the full path to the file. You can t browse for the file because you ll get an Access Denied error trying to browser through any of the folders. Now that you ve seen both IIS and NTFS configuration settings, lets take a look at the various ways you can configure ASP.NET.

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