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Using the current file, this code will succeed, and you ll be able to access the current node through the validating reader in the same way that you can with an ordinary reader. 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 XmlSettings.ValidationEventHandler event just before you start to read the XML file: // Connect to the method named MyValidateHandler. settings.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.

WriteAllText(), WriteAllLines(), and WriteAllBytes() GetAccessControl()

Summary

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.

The only feature that the File class lacks (and the FileInfo class provides) is the ability to retrieve the size of a specified file.

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In this chapter, you got a taste of ASP.NET s XML features. The class libraries for interacting with XML are available to any .NET application, whether it s a Windows application, a web application, or a simple command-line tool. They provide one of the most fully featured toolkits for working with XML and other standards such as XPath, XML Schema, and XSLT. XML is a vast topic, and there is much more to cover, such as advanced navigation, search and selection techniques, validation, and serialization. If you want to learn more about XML in .NET, you may want to refer to Pro .NET XML (Apress, 2005). But remember that you should use XML only where it s warranted. XML is a great tool for persisting file-based data in a readable format and for sharing information with other application components and services. However, it doesn t replace the core data management techniques you ve seen in previous chapters.

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

The File and Directory methods are completely intuitive. For example, you could use this code to write a dynamic list displaying the name of each file in the current directory: Dim strDirectoryName As String = "c:\Temp" ' Retrieve the list of files, and display it in the page. Dim fileList As String() = Directory.GetFiles(ftpDirectory) For Each file As String In fileList lstFiles.Items.Add(file) Next Because the list of files is simply an ordinary list of strings, it can easily be bound to a list control, resulting in the following more efficient syntax for displaying the files on a page:

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