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// Show the directory listing. lblCurrentDir.Text = "Currently showing " + path; gridFileList.DataSource = files; gridDirList.DataSource = dirs; Page.DataBind(); // Clear any selection. gridFileList.SelectedIndex = -1; // Keep track of the current path. ViewState["CurrentPath"] = path; } When the page first loads, it calls this method to show the current application directory: protected void Page_Load(object sender, System.EventArgs e) { if (!Page.IsPostBack) { ShowDirectoryContents(Server.MapPath(".")); } } You ll notice that the ShowDirectoryContents() method stores the currently displayed directory in view state. That allows the Move Up button to direct the user to a directory that s one level above the current directory: protected void cmdUp_Click(object sender, System.EventArgs e) { string path = (string)ViewState["CurrentPath"]; path = Path.Combine(path, ".."); path = Path.GetFullPath(path); ShowDirectoryContents(path); } To move down through the directory hierarchy, the user simply needs to click a directory link. This is raised as a SelectedIndexChanged event. The event handler then displays the new directory: protected void gridDirList_SelectedIndexChanged(object source, EventArgs e) { // Get the selected directory. string dir = (string)gridDirList.DataKeys[gridDirList.SelectedIndex].Value; // Now refresh the directory list to // show the selected directory. ShowDirectoryContents(dir); } But what happens if a user selects a file from the second GridView In this case, the code retrieves the full file path, creates a new FileInfo object, and binds it to a FormView control, which uses a template to display several pieces of information about the file. Figure 13-2 shows the result.

By creating a custom error class, as a subclass of , it s easy to override these methods to provide custom markup when errors are displayed. This markup includes any containing elements, such as , as the entire markup will be dropped in place wherever the field s errors are displayed, whether as part of the default markup, or by accessing the field s attribute directly. By default, the method is used to render errors, though templates that wish to do further customizations can call whichever method makes the most sense for the template. In fact, it s possible to add entirely new methods and even override which method is used by default by also overriding the method. It s also possible for templates to simply loop through the errors in this list and wrap each one in whatever markup makes sense for the situation. Writing a custom subclass isn t quite enough; it also has to be passed into the form somehow to make sure it gets used. This is also quite simple: just pass the custom class into the form s constructor as the argument. In addition to displaying errors on individual fields, a form s method allows errors to be shown for form-wide validation failures. Displaying this in the template requires accessing the form s method.

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Figure 13-2. Examining a file Here s the code that binds the file information when a file is selected: protected void gridFileList_SelectedIndexChanged(object sender, System.EventArgs e) { // Get the selected file. string file = (string)gridFileList.DataKeys[gridFileList.SelectedIndex].Value; // The FormView shows a collection (or list) of items. // To accommodate this model, you must add the file object // to a collection of some sort. ArrayList files = new ArrayList(); files.Add(new FileInfo(file)); // Now show the selected file. formFileDetails.DataSource = files; formFileDetails.DataBind(); } The FormView uses the following template: <asp:FormView id="formFileDetails" runat="server"> <ItemTemplate> <b>File: <%# DataBinder.Eval(Container.DataItem, "FullName") %></b><br> Created at <%# DataBinder.Eval(Container.DataItem, "CreationTime") %><br> Last updated at <%# DataBinder.Eval(Container.DataItem, "LastWriteTime") %><br> Last accessed at <%# DataBinder.Eval(Container.DataItem, "LastAccessTime") %><br> <i><%# DataBinder.Eval(Container.DataItem, "Attributes") %></i><br> <%# DataBinder.Eval(Container.DataItem, "Length") %> bytes.

mapping, and the XmlAdapter class for more powerful DataSet-to-XML conversions, to name just a few). These may turn up again in separate toolkits or later versions of .NET, but for now developers are out of luck. So, what does that leave us with Here are some genuinely interesting ADO.NET changes that are still around: Provider factories: The dream of generic data access code (code you can write once and use with multiple different databases) takes a giant leap forward in .NET 2.0 thanks to provider factories new components that can create strongly typed Connection, Command, and DataAdapter objects on the fly. You ll learn about them in this chapter. Change notification: To build truly scalable web applications, you need to cache data that s retrieved from a database so it can be reused without connecting to the data source each time. However, caching introduces the possibility of out-of-date information. ADO.NET includes a new change notification feature that you can use to automatically remove cached data when the related records in the database change. You ll learn about this feature in 11. Connection statistics: It s a small frill, but the new connection-tracking features of the SqlConnection object might help you profile different data access strategies. They re introduced in this chapter. SQL Server 2005: SQL Server 2005 introduces a whole set of new features, and ADO.NET 2.0 supports them seamlessly. These features include user-defined data types that are based on .NET classes, as well as stored procedures written with .NET languages. For more information about these features, refer to a dedicated SQL Server 2005 book such as A First Look at Microsoft SQL Server 2005 for Developers (Addison-Wesley, 2004) or Pro SQL Server 2005 Assemblies (Apress, 2005).

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