C# WinForms Threading

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace WinFormsThreading
{
    public partial class Form1 : Form
    {
        Thread myThread;
        public Form1()
        {
            InitializeComponent();

            myThread = new Thread(countDown);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            myThread.Start();
        }

        private void countDown()
        {
            for (int i = 5; i >= 0; i--)
            {
                label1.Invoke(new MethodInvoker(delegate //Invoke to the "dispatcher" that belongs to the UI thread
                {
                    label1.Text = Convert.ToString(i);
                }
                ));
                Thread.Sleep(1000);
            }
        }
    }
}