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<asp:XmlDataSource ID="sourceDVD" runat="server" DataFile="DvdList.xml" TransformFile="DVDTreeList.xsl" /> One good reason to use the XSLT features of the XmlDataSource is to get your XML data ready for display in a hierarchical control such as the TreeView. For example, imagine you want to create a list of stars grouped by movie. You also want to put all the content into attributes so it s easy to bind. Here s the final XML you d like: <Movies> <DVD ID="1" Title="The Matrix"> <Star Name="Keanu Reeves" /> <Star Name="Laurence Fishburne" /> </DVD> <DVD ID="2" Title="Forest Gump"> <Star Name="Tom Hanks" /> <Star Name="Robin Wright" /> </DVD> ... </Movies> You can transform the original XML into this markup using the following XSL stylesheet: <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:output method="xml"/> <xsl:template match="/"> <!-- Rename the root element. --> <xsl:element name="Movies"> <xsl:apply-templates select="//DVD" /> </xsl:element> </xsl:template> <xsl:template match="DVD"> <!-- Keep the DVD element with the same name. --> <xsl:element name="{name()}"> <!-- Keep the ID attribute. --> <xsl:attribute name="ID"> <xsl:value-of select="@ID"/> </xsl:attribute> <!-- Put the nested <Title> text into an attribute. --> <xsl:attribute name="Title"> <xsl:value-of select="Title/text()"/> </xsl:attribute> <xsl:apply-templates select="Starring" /> </xsl:element> </xsl:template> <xsl:template match="Starring"> <xsl:element name="Stars"> <!-- Put the nested <Star> text into an attribute. --> <xsl:attribute name="Name"> <xsl:value-of select="Star/text()"/> </xsl:attribute> </xsl:element> </xsl:template> </xsl:stylesheet>

Remember that when you interact with your data as XML, all the customary database-oriented concepts such as relationships and unique constraints go out the window. The only reason you should interact with your DataSet as XML is if you need to perform an XML-specific task. You shouldn t use XML manipulation to replace the approaches used in earlier chapters to update data. In most cases, you ll find it easier to use advanced controls such as the GridView, rather than creating a dedicated XSL stylesheet to transform data into the HTML you want to display.

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Now let s create another <DVD> element using the same approach: ... writer.WriteStartElement("DVD"); // Write a couple of attributes to the <DVD> element. writer.WriteAttributeString("ID", "2"); writer.WriteAttributeString("Category", "Drama"); // Write some simple elements. writer.WriteElementString("Title", "Forrest Gump"); writer.WriteElementString("Director", "Robert Zemeckis"); writer.WriteElementString("Price", "23.99"); // Open the <Starring> element. writer.WriteStartElement("Starring"); // Write two elements. writer.WriteElementString("Star", "Tom Hanks"); writer.WriteElementString("Star", "Robin Wright"); // Close the <Starring> element. writer.WriteEndElement(); // Close the <DVD> element. writer.WriteEndElement(); ... This is quite straightforward, isn t it To complete the document, you simply need to close the <DvdList> item, with yet another call to WriteEndElement(). You can then close the XmlTextWriter, as shown here: ... writer.WriteEndElement(); writer.Close(); } To try this code, call the WriteXML() procedure from the Page.Load event handler. It will generate an XML file named DvdList.xml in the current folder, as shown in Figure 12-1.

Now you can bind this to the TreeView and display it with this set of bindings: <asp:TreeView ID="TreeView1" runat="server" DataSourceID="sourceDVD" AutoGenerateDataBindings="False"> <DataBindings> <asp:TreeNodeBinding DataMember="Movies" Text="Movies" /> <asp:TreeNodeBinding DataMember="DVD" TextField="Title" /> <asp:TreeNodeBinding DataMember="Stars" TextField="Name" /> </DataBindings> </asp:TreeView>

SQL Server 2000 and later provide built-in support for XML. You can execute any query and return the results as an XML fragment by adding the FOR XML clause to your query. This feature is completely separate from the XML features of the DataSet. However, it gives you another way to retrieve data from one or more tables in a database and work with it as XML.

Keep in mind that when you use the XmlTextWriter to create an XML file, you face all the limitations that you face when writing any other type of file in a web application. In other words, you need to take safeguards (such as generating unique filenames) to ensure that two different clients don t run the same code and try to write the same file at once. 13 has more information about file access and dealing with these types of problems.

So far, all the examples you ve seen have bound to XML content in a file. This is the standard scenario for the XmlDataSource control, but it s not your only possibility. The other option is to supply the XML as text through the XmlDataSource.Data property. You can set the Data property at any point before the binding takes place. One convenient time is during the Page.Load event: protected void Page_Load(object sender, EventArgs e) { string xmlContent; // (Retrieve XML content from another location.) sourceDVD.Data = xmlContent; }

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