Answer 1

I saved the code bellow in my codes:

using System;
using System.Xml.Linq;
using System.Xml.Xsl;
using System.Xml;
using System.IO;

public class Program
{
public static void Main()
{
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);
}
}