Writing CRLF

 w.Formatting = Formatting.Indented;
w.Indentation = 5;

using System;
using System.Xml;
using System.IO;
namespace WriteToXML
{
    class Program
    {
        static void Main(string[] args)
        {
            string _path = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);
            _path = _path.Substring(6, _path.Length - 6);
            string _file =  _path + "\\article.xml";
            FileStream fs = new FileStream(_file, FileMode.Create);
            XmlTextWriter w = new XmlTextWriter(fs, null);
            w.Formatting = Formatting.Indented;
            w.Indentation = 5;
            w.WriteStartDocument();
            w.WriteStartElement("articles");
            w.WriteComment("This file was generated by the XmlTextWriter class");
            //write content
            w.WriteStartElement("article");
            w.WriteStartElement("timestamp");
            w.WriteString(DateTime.Now.ToString());
            w.WriteEndElement();
            w.WriteStartElement("subject");
            w.WriteString("subject");
            w.WriteEndElement();
            w.WriteStartElement("body");
            w.WriteString("This is a test");
            w.WriteEndElement();
            w.WriteStartElement("entryID");
            w.WriteEndElement();
            w.WriteStartElement("deleted");
            w.WriteString("No");
            w.WriteEndElement();
            //close root element
            w.WriteEndElement();
            w.WriteEndDocument();
            w.Close();
        }
    }
}