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The DirectoryTree control shows the directory tree for a single drive. The currently selected drive is stored as a single character (technically, a char). Another approach would be to use an instance of the System.IO.DirectoryInfo class to track or set the currently highlighted directory. That approach would provide better control for the application programmer, but it would complicate design-time support. private char drive; public char Drive { get { return drive; } set { drive = value; RefreshDisplay(); } } Whenever the Drive property is set, the RefreshDisplay() method is called to build the tree. The RefreshDisplay() method clears the current display, and then calls another method named Fill() to fill the root node. The reason that you need to split the logic into two methods is because Fill() needs to be called at different times to fill in different levels of the directory tree. public void RefreshDisplay() { // Erase the existing tree. Nodes.Clear(); // Set the first node. TreeNode rootNode = new TreeNode(drive + ":\\"); Nodes.Add(rootNode); // Fill the first level and expand it. Fill(rootNode); Nodes[0].Expand(); } The RefreshDisplay() method is public so that you can trigger a refresh whenever it s needed. You could also use a component like the FileSystemWatcher to receive notification whenever directories are added or removed, and refresh the tree accordingly. The Fill() method takes a single node, and fills in the first level of directories for that node. However, the Fill() method doesn t go any further to fill in deeper levels of nested subdirectories. If it did, the code would grind to a halt while the tree is being filled. Instead, the Fill() method adds an asterisk placeholder. The user won t see the asterisk because the directory nodes are initially in a collapsed state.

private void Fill(TreeNode dirNode) { DirectoryInfo dir = new DirectoryInfo(dirNode.FullPath); foreach (DirectoryInfo dirItem in dir.GetDirectories()) { // Add node for the directory. try { TreeNode newNode = new TreeNode(dirItem.Name); dirNode.Nodes.Add(newNode); newNode.Nodes.Add("*"); } catch (Exception err) { // An exception could be thrown in this code if you don't // have sufficient security permissions for a file or directory. // You can catch and then ignore this exception. } } } The trick is that every time a subdirectory branch is expanded, that level is filled in first using the OnBeforeExpand() method. This just-in-time directory process unfolds speedily, so the user will never realize that it s taking place. (The only other possible step is to fill the tree asynchronously, which you could do using a technique similar to the BitmapViewer in the previous chapter.) protected override void OnBeforeExpand(TreeViewCancelEventArgs e) { base.OnBeforeExpand(e); // If a dummy node is found, remove it and read the real directory list. if (e.Node.Nodes[0].Text == "*") { e.Node.Nodes.Clear(); Fill(e.Node); } }

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retrieves session state data to and from an entirely different data source such as MySQL or even a flat file. The latest release of ODP.NET features a suite of ASP.NET providers specifically created for the Oracle database, collectively referred to as the Oracle Providers for ASP.NET. Table 1-3 lists the various ASP.NET providers and describes what they do. Table 1-3. The Oracle Providers for ASP.NET

long_radians)) * 3956 <= 5; +--------------------------------+-------------+-------+-------+ | address | city | state | zip | +--------------------------------+-------------+-------+-------+ | WHITE MARSH MALL 8200 PERRY H | BALTIMORE | MD | 21236 | | 8200 PERRY HALL BOULEVARD WHI | WHITE MARSH | MD | 21236 | | 8641 PHILADELPIA ROAD | BALTIMORE | MD | 21237 | | 2401 CLEANLEIGH DRIVE | PARKVILLE | MD | 21234 | | 1971 EAST JOPPA ROAD | TOWSON | MD | 21234 | | 4921 CAMPBELL ROAD | WHITE MARSH | MD | 21162 | | 7400 EAST BELAIR ROAD | BALTIMORE | MD | 21236 | | 5246 HARFORD ROAD | HAMILTON | MD | 21214 | | 9103 BELAIR ROAD | PERRY HALL | MD | 21236 | +--------------------------------+-------------+-------+-------+ 9 rows in set (012 sec) Well, this variation was marginally faster.

The last step is to replace the AfterSelect event with a higher-level DirectorySelected event, just as in the ProjectTree. In this case, the DirectorySelectedEventArgs provides a single piece of information the full path of the selected directory.

This membership provider provides functionality to manage (create, edit, and delete) users, retrieve users, verify login credentials, reset passwords, and handle other user-management related tasks. This role provider implements the functionality of managing (creating, editing, and deleting) roles, retrieving roles, checking the list of users in a role, and handling other role-management related tasks. This provider enables the ASP.NET application to store and retrieve individual user profile information to and from an Oracle database. This provider retrieves site map information from an Oracle database and builds a tree of SiteMapNode objects. It also implements the functions that allow the ASP.NET application to find and retrieve nodes from this tree. This provider allows the ASP.NET application to store and retrieve session state to and from an Oracle database. This provider processes ASP.NET health events and stores them in the Oracle database. Web Parts is a Microsoft technology that enables the end user to modify the content and layout of web pages directly in the browser. This sort of personalization data is usually stored in a database. The Oracle Web Parts Personalization provider allows

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