Simple MULTI THREAD

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

namespace TestDaLuong
{
    class Program
    {
        static void Main(string[] args)
        {
            Thread t1 = new Thread(new ThreadStart(a));
            Thread t2 = new Thread(new ThreadStart(b));
            Thread t3 = new Thread(new ThreadStart(c));
            t1.Start();
            t2.Start();
            t3.Start();
            Console.ReadLine();
        }
        static void a()
        {
            for (int i = 0; i < 100; i++)
            {
                Console.Write("1");
            }
        }
        static void b()
        {
            for (int i = 0; i < 100; i++)
            {
                Console.Write("2");
            }
        }
        static void c()
        {
            for (int i = 0; i < 100; i++)
            {
                Console.Write("3");
            }
        }
    }
}