string xslMarkup = @"<?xml version='1.0'?>

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' version='1.0'>

    <xsl:template match='/Parent'>

        <Root>

            <C1>

            <xsl:value-of select='Child1'/>

            </C1>

            <C2>

            <xsl:value-of select='Child2'/>

            </C2>

        </Root>

    </xsl:template>

</xsl:stylesheet>";

            XDocument xmlTree = new XDocument(

                new XElement("Parent",

                    new XElement("Child1", "Child1 data"),

                    new XElement("Child2", "Child2 data")

                )

            );

            XDocument newTree = new XDocument();

            using (XmlWriter writer = newTree.CreateWriter())

            {

                // Load the style sheet.

                XslCompiledTransform xslt = new XslCompiledTransform();

                xslt.Load(XmlReader.Create(new StringReader(xslMarkup)));

                // Execute the transform and output the results to a writer.

                xslt.Transform(xmlTree.CreateReader(), writer);

            }

            Console.WriteLine(newTree);