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Here s the code you need: private void ReadXML() { string xmlFile = Server.MapPath("DvdList.xml"); // Create the reader. XmlTextReader reader = new XmlTextReader(xmlFile); StringBuilder str = new StringBuilder(); // Loop through all the nodes. while (reader.Read()) { switch(reader.NodeType) { case XmlNodeType.XmlDeclaration: str.Append("XML Declaration: <b>"); str.Append(reader.Name); str.Append(" "); str.Append(reader.Value); str.Append("</b><br />"); break; case XmlNodeType.Element: str.Append("Element: <b>"); str.Append(reader.Name); str.Append("</b><br />"); break; case XmlNodeType.Text: str.Append(" - Value: <b>"); str.Append(reader.Value); str.Append("</b><br />"); break; } ... After handling the types of nodes you re interested in, the next step is to check if the current node has attributes. The XmlTextReader doesn t have an Attributes collection, but an AttributeCount property returns the number of attributes. You can continue moving the cursor forward to the next attribute until MoveToNextAttribute() returns false. ... if (reader.AttributeCount > 0) { while(reader.MoveToNextAttribute()) { str.Append(" - Attribute: <b>"); str.Append(reader.Name); str.Append("</b> Value: <b>"); str.Append(reader.Value); str.Append("</b><br />"); } } } // Close the reader and show the text. reader.Close(); XmlText.Text = str.ToString(); }

In some cases you might want to combine transformed HTML output with other content and web controls. In this case, you can use the Xml control. The Xml control displays the result of an XSL transformation in a discrete portion of a page. For example, consider the previous XSLT example, which transformed DvdList.xml using DvdList.xsl. Using the Xml control, all you need is a single tag that sets the DocumentSource and TransformSource properties, as shown here: <asp:Xml runat="server" DocumentSource="DvdList.xml" TransformSource="DvdList.xsl" /> The best part of this example is that all you need to do is set the XML input and the XSL transform file. You don t need to manually initiate the conversion.

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(For example, create a query that refers to a nonexistent table) The other possible point of failure is when you attempt to open the connection An exception occurs here if the connection string is invalid or if you re trying to connect a database server that doesn t exist Although it s easy to catch the resulting exception, it s not as easy to deal with it gracefully That s because this error occurs in your begin method Once you ve reached the begin method, you re at the point of no return you ve started an asynchronous operation, and ASPNET expects you to return an IAsyncResult object If you return a null reference, the page processing will be interrupted with an InvalidOperationException The solution is to create a custom IAsyncResult class that signals the operation is complete.

In the last two lines the procedure concludes by flushing the content in the buffer and closing the reader When using the XmlTextWriter, it s imperative you finish your task and close the reader as soon as possible, because it retains a lock on the file, unlike the XmlDocument, which loads all the information into memory when you call the Load() method If you run this code now, you ll see a web page that s quite similar to the earlier examples with the XmlDocument and XPathNavigator The XmlTextReader provides additional methods that help make reading XML even faster and more convenient if you know what structure to expect For example, you can use MoveToContent(), which skips over irrelevant nodes (such as comments, whitespace, and the XML declaration) and stops on the declaration of the next element.

Now that you ve learned how to read, write, and display XML by hand, it s worth considering a shortcut that can save a good deal of code the XmlDataSource control. The XmlDataSource control works in a declarative way that s analogous to the SqlDataSource and ObjectDataSource controls you learned about in 9. However, it has two key differences: The XmlDataSource extracts information from an XML file, rather than a database or data access class. It provides other controls with an XmlDocument object for data binding. XML content is hierarchical and can have an unlimited number of levels. By contrast, the SqlDataSource and ObjectDataSource return flat tables of data. The XmlDataSource also provides a few features in common with the other data source controls, including caching and rich design support that shows the schema of your data in bound controls. In the following sections, you ll see how to use the XmlDataSource in simple and complex scenarios.

This IAsyncResult class can also track the exception details, so you can retrieve them in your end method and use them to report the error Here s an IAsyncResult-based class that includes these details: public class CompletedSyncResult : IAsyncResult { // Track the offending error private Exception operationException; public Exception OperationException { get { return operationException; }.

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