XProcessingInstruction

using System;/*from   j a va2  s  .  c  o m*/
using System.Data;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
using System.IO;


public class MainClass{

   public static void Main(string[] args){   
      XDocument NewDoc = new XDocument(
            new XDeclaration("1.0", "utf-8", "yes"),
            new XElement("Root", "MyDoc"));
         // Add the processing instruction.
         NewDoc.AddFirst(new XProcessingInstruction(
            "xml-stylesheet", 
            "type='text/xsl' href='MyXSL.XSL'"));


   }
}