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<DvdList> <Retailer ID="..." Name="...">...</Retailer> <Retailer ID="..." Name="...">...</Retailer> <DVD ID="..." Category="...">...</DVD> <DVD ID="..." Category="...">...</DVD> <DVD ID="..." Category="...">...</DVD> </DvdList> the GridView will inspect the first node and create an ID and Name column. It will then attempt to display ID and name information for each node. If no matching attribute is found (for example, the <DVD> specifies a name), then that value will be left blank. Similarly, the Category attribute won t be used, unless you explicitly define it as a column. All of this raises an obvious question how do you display other information from deeper down in the XML document You have a few options: You can use XPath to filter out the important elements. You can use an XSL transformation to flatten the XML into the structure you want. You can nest one data control inside another (similar to the way that the master-child details grid was created in 10). You can use a control that supports hierarchical data. The only ready-made .NET control that fits is the TreeView. You ll see all of these techniques in the following sections.

// No error, so run the query asynchronously. return cmd.BeginExecuteReader(cb, state); } The only problem with this approach is that you need to explicitly check the type of IAsyncResult object in your end method. That way, you can detect an error condition. private void EndTask(IAsyncResult ar) { if (ar is CompletedSyncResult) { lblError.Text = "A connection error occurred.<br />"; // Demonstrate how exception details can be retrieved. lblError.Text += ((CompletedSyncResult)ar).OperationException.Message; return; } // Otherwise, you can retrieve the DataReader. try { reader = cmd.EndExecuteReader(ar); } catch (SqlException err) { lblError.Text = "The query failed."; } } To try this, modify the connection string to point to an invalid server or database, and run the page. Your begin method will catch the error, and your end method will deal with it appropriately (in this example, by showing a message on the page).

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Ordinarily, when you bind an XmlNode, you display only attribute values. However, you can get the text from nested elements using XPath data binding expressions. The most flexible way to do this is to use a template that defines XPath data binding expressions. XPath data binding expressions are similar to Eval() expressions, except instead of supplying the name of the field you want to display, you supply an XPath expression based on the current node. For example, here s an XPath expression that starts at the current node, looks for a child element called Title, and gets associated element text: <%# XPath("Title")%> Here s an XPath expression that filters out the text of an ID attribute for the current node: <%# XPath("@ID")%>

Before you can perform a transformation, you need to create an XSL stylesheet that defines how the conversion should be applied. XSL is a complex standard in fact, it can be considered a genuine language of its own with conditional logic, looping structures, and more.

Ideally, this tactic (checking the object type) wouldn t be necessary. Instead, you would simply call the EndExecuteReader() method and pass in the CompletedSyncResult object, and it would rethrow whatever exception object is stored in the CompletedSyncResult.OperationException property. Unfortunately, you can t implement this design because you don t own the EndExecuteReader() code. The only alternative is to wrap the BeginExecuteReader() and EndExecuteReader() methods in another, higher-level class (which is needlessly complex) or inspect the IAsyncResult object as shown here.

Many of Visual Studio s most welcome enhancements appear when you start to write the code that supports your user interface. To start coding, you need to switch to the code-behind view. To switch back and forth, you can use two buttons that are placed just above the Solution Explorer window. The tooltips identify these buttons as View Code and View Designer. When you switch to code view, you ll see the page class for your web page. You ll learn more about code-behind later in this chapter. ASP.NET is event-driven, and everything in your web-page code takes place in response to an event. To create a simple event handler for the Button.Click event, double-click the button in design view. Here s a simple example that displays the current date and time in a label: Protected Sub Button1_Click (ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click Label1.Text = "Current time: " & DateTime.Now.ToLongTimeString() End Sub To test this page, select Debug Start Debugging from the menu. Because this is the first time running any page in this application, Visual Studio will inform you that you need a configuration file that specifically enables debugging (see Figure 2-13).

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