C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;


namespace xmlWriter_test
{
    class Xmlwriter
    {
        public XmlTextWriter txtWriter { get; set; }
        public string xmlPath { get; set; }
        public Object thislock = new Object();

        public Xmlwriter(string path)
        {
            xmlPath = path;
            txtWriter = new XmlTextWriter(path, null);
        }
        public void writeElement(string element, string data)
        {
            try
            {
                lock (thislock)
                {
                    //txtWriter.WriteStartDocument();
                    txtWriter.WriteStartElement(element);
                    txtWriter.WriteString(data);
                    txtWriter.WriteEndElement();
                    Console.WriteLine("good job !!");
                    //txtWriter.WriteEndDocument();
                }
            }
            catch (InvalidOperationException e)
            {
                Console.WriteLine("erreur :" + e.Message);
            }
        }
        public void startDocument()
        {
            txtWriter.WriteStartDocument();
        }
        public void endDocument()
        {
            try
            {
                txtWriter.WriteEndDocument();
            }
            catch (ArgumentException arg)
            { Console.WriteLine("erreur :" + arg.Message); }
        }
        public void closeDocument()
        {
            txtWriter.Close();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Data.OleDb;
using System.Data;
using System.Threading;

namespace xmlWriter_test
{
    class Program
    {
        static int i = 0;
        static Xmlwriter wifixmlWriter = new Xmlwriter(@"D:\wifi_test.xml");

        static void Main(string[] args)
        {
            //start document
            wifixmlWriter.startDocument();
            Thread th = new Thread(new ThreadStart(background));
            Console.WriteLine("starting thread..."); 
            th.Start();

            //end 
            th.Join();
            wifixmlWriter.endDocument();
            Console.WriteLine("press any key to quit");
            Console.ReadKey();
        }

        static public void background()
        {
            //just looop xD
            while (i<50)
            {
                Console.WriteLine("i = {0}", i++);
                //writing in the xml file
                wifixmlWriter.writeElement("hello", "i = " + i);
 
            }
        }
    }
}

public void LoadFileInDefaultEditor(AppLaunchArgs args)
{
    var processStartInfo = new ProcessStartInfo(args.ApplicationExePath)
    {
        Arguments = "\"" + args.Path + "\"",
        WorkingDirectory = Path.GetDirectoryName(args.ApplicationExePath),
        Verb = OpenVerb
    };

    try
    {
        Process.Start(processStartInfo);
    }
    catch (Exception ex)
    {
        Log.Error("Failed to start " + args.ApplicationExePath, ex);
    }
}