.Net Threading Problem

ThreadStart threadStart = controller.OpenFile;
Thread thread = new Thread(threadStart);
thread.Start();

System.Console.Error.WriteLine("Launching");

using System;
using System.Threading;

namespace Net_Threading_Problem
{
    class Program
    {
        static void Main()
        {
            Controller controller = new Controller();
            ThreadStart threadStart = controller.OpenFile;
            Thread thread = new Thread(threadStart);
            thread.Start();

            thread.Join();
        }
    }

    internal class Controller
    {
        public void OpenFile()
        {
            Console.Error.WriteLine("Launching");
        }
    }
}