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Here s an example that creates a simple version of the SuperProProductList document: ' Place the file in the App_Data subfolder of the current website. ' The System.IO.Path class makes it easy to build the full file name. Dim file As String = Path.Combine(Request.PhysicalApplicationPath, _ "App_Data\SuperProProductList.xml") Dim fs As New FileStream(file, FileMode.Create) Dim w As New XmlTextWriter(fs, Nothing) w.WriteStartDocument() w.WriteStartElement("SuperProProductList") w.WriteComment("This file generated by the XmlTextWriter class.") ' Write the first product. w.WriteStartElement("Product") w.WriteAttributeString("ID", "", "1") w.WriteAttributeString("Name", "", "Chair") w.WriteStartElement("Price") w.WriteString("49.33") w.WriteEndElement() w.WriteEndElement() ' Write the second product. w.WriteStartElement("Product") w.WriteAttributeString("ID", "2") w.WriteAttributeString("Name", "Car") w.WriteStartElement("Price") w.WriteString("43399.55") w.WriteEndElement() w.WriteEndElement() ' Write the third product. w.WriteStartElement("Product") w.WriteAttributeString("ID", "3") w.WriteAttributeString("Name", "Fresh Fruit Basket") w.WriteStartElement("Price") w.WriteString("49.99") w.WriteEndElement() w.WriteEndElement()

Figure 18-9. Unformatted XML content However, you can also apply an XSLT style sheet, either by assigning an XslCompiledTransform object to the Transform property or by using a string that refers to the XSLT file with the TransformSource property: // Specify a XSLT file. XmlProducts.TransformSource = Path.Combine(Request.PhysicalApplicationPath, @"App_Data\SuperProProductList.xsl"); Now the output is automatically formatted according to your style sheet (see Figure 18-10).

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' Close the root element. w.WriteEndElement() w.WriteEndDocument() w.Close() This code is similar to the code used for writing a basic text file. It does have a few advantages, however. You can close elements quickly and accurately, the angle brackets (< >) are included for you automatically, and some errors (such as closing the root element too soon) are caught automatically, thereby ensuring a well-formed XML document as the final result. To check that your code worked, open the file in Internet Explorer, which automatically provides a collapsible view for XML documents (see Figure 19-1).

Now that your tour of XML and ASP.NET is drawing to a close, you should have a basic understanding of what XML is, how it looks, and why you might use it in a web page. XML represents a new tool for breaking down the barriers between businesses and platforms it s nothing less than a universal model for storing and communicating all types of information.

The section element may include sect1 through sect5 tags, which can be used to create logical sections for a chapter. The sect tags must be nested within one another, so a sect2 must have sect1 as a parent, sect3 must have sect2 as a parent, and so on. Each sect element may contain a title and any number of paragraphs or subsections up to sect5 depth. Listing 6-10 shows an example of a section element. Listing 6-10. DocBook section Tags <chapter> <sect1> <title>Section 1 Title</title> <para>Section one lead-in text</para> <sect2> <title>Subsection</title> <para>. . .</para> </sect2> </sect1> </chapter>

XML on its own is a remarkable innovation. However, to get the most out of XML, you need to embrace other standards that allow you to validate XML, transform it, and search it for specific information. The .NET Framework provides classes for all these tasks in the namespaces under the System.Xml branch. To continue your exploration, start with a comprehensive review of XML standards (such as the one provided at http://www.w3schools.com/xml) and then dive into the class library.

By default, the XmlTextWriter will create an XML file that has all its elements lumped together in a single line without any helpful carriage returns or indentation. You don t see this limitation in Figure 19-1, because Internet Explorer uses a style sheet to give the XML a more readable (and more colorful) appearance. However, if you open the XML document in Notepad, you ll see the difference. Although additional formatting isn t required (and doesn t change how the data will be processed), it can make a significant difference if you want to read your XML files in Notepad or another text editor. Fortunately, the XmlTextWriter supports formatting; you just need to enable it, as follows: ' Set it to indent output. w.Formatting = Formatting.Indented ' Set the number of indent spaces. w.Indentation = 5

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