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Using the current file, this code will succeed, and you ll be able to access the current node through the XmlValidatingReader object in the same way that you can with the XmlTextReader. However, consider what happens if you make the minor modification shown here: <DVD ID="A" Category="Science Fiction"> Now when you try to validate the document, an XmlSchemaException (from the System.Xml.Schema namespace) will be thrown, alerting you to the invalid data type the letter A in an attribute that is designated for integer values. Instead of catching errors, you can react to the ValidationEventHandler event. If you react to this event, you ll be provided with information about the error, but no exception will be thrown. To connect an event handler to this event, create a new ValidationEventHandler delegate and assign it to the XmlValidatingReader.ValidationEventHandler event just before you start to read the XML file: // Connect to the method named MyValidateHandler. vr.ValidationEventHandler += new ValidationEventHandler(ValidateHandler); The event handler receives a ValidationEventArgs class, which contains the exception, a message, and a number representing the severity: private void ValidateHandler(Object sender, ValidationEventArgs e) { lblInfo.Text += "Error: " + e.Message + "<br />"; } To try the validation, you can use the XmlValidation.aspx page in the online samples. This page allows you to validate a valid DVD list as well as another version with incorrect data and an incorrect tag. Figure 12-7 shows the result of a failed validation attempt.

With the default Visual Studio settings, the Error List appears automatically whenever you build a project that has errors (see Figure 2-10).

However, this has a catch. As explained earlier, the XmlDocument.Nodes collection contains only the first level of nodes. Each of these nodes can contain nested nodes through its own XmlNode.Nodes collection. However, the IEnumerable implementation that the XmlDocument uses doesn t take this into account. It walks over only the upper level of XmlNode objects, and as a result you ll see only the top level of nodes, as shown in Figure 12-9.

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Figure 2-10. Viewing build errors in a project To see the Task List, choose View Other Windows Task List. Two types of tasks exist user tasks and comments. You can choose which you want to see from the drop-down list at the top of the Task List. User tasks are entries you ve specifically added to the Task List. You create these by clicking the Create User Task icon (which looks like a clipboard with a check mark) in the Task List. You can give your task a basic description, a priority, and a check mark to indicate when it s complete.

Another related standard is XSL (Extensible Stylesheet Language), which is an XML-based language for creating stylesheets. Stylesheets (also known as transforms) are special documents that can be used (with the help of an XSLT processor) to convert your XML documents into other documents. For example, you can use an XSLT stylesheet to transform one type of XML to a different XML structure. Or you could use a stylesheet to convert your data-only XML into another text-based document such as an HTML page, as you ll see with the next example.

You can make this binding explicit by defining columns for each attribute: <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="sourceDVD"> <Columns> <asp:BoundField DataField="ID" HeaderText="ID" SortExpression="ID" /> <asp:BoundField DataField="Category" HeaderText="Category" SortExpression="Category" /> </Columns> </asp:GridView> In other words, if you don t customize the XML data binding process, you can bind only to the top-level of nodes, and you can display text only from the attributes of that node. Furthermore, if there is more than one type of top-level node, the bound control uses the schema of the first node. In other words, if you have a document like this:

set { operationException = value; } } // Maintain all the details for the asynchronous operation. public CompletedSyncResult(Exception operationException, AsyncCallback asyncCallback, object asyncState) { state = asyncState; OperationException = operationException; // Code that triggers the callback, if it's used. if (asyncCallback != null) { asyncCallback(this); } } // Implement the IAsyncState interface. // Use hard-coded values that indicate the task is always considered complete. private object state; object IAsyncResult.AsyncState { get { return state; } } WaitHandle IAsyncResult.AsyncWaitHandle { get { return null; } } bool IAsyncResult.CompletedSynchronously { get { return true; } } bool IAsyncResult.IsCompleted { get { return true; } } } Now if a connection error occurs, you can return an instance of this connection object instead of relying on the BeginExecuteReader() method. Here s the changed code: private IAsyncResult BeginTask(object sender, EventArgs e, AsyncCallback cb, object state) { ... // Open the connection. try { con.Open(); } catch (Exception err) { return new CompletedSyncResult(err, cb, state); }

Of course, XSL stylesheets shouldn t be confused with CSS (Cascading Style Sheets), a standard used to format HTML. 15 discusses CSS.

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