using System;

using System.Threading;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(DateTime.Now.ToString());

        Console.WriteLine();

        Thread t = new Thread(Worker);

        Thread t1 = new Thread(Worker);

        Thread t2 = new Thread(Worker);

        Thread t3 = new Thread(Worker);

        Thread t4 = new Thread(Worker);

        t.Start();

        t1.Start();

        t2.Start();

        t3.Start();

        t4.Start();

        t.Join();

        t1.Join();

        t2.Join();

        t3.Join();

        t4.Join();

        Console.WriteLine("Done");

    }

​

    static void Worker()

    {

        for (int i = 0; i < 100; i++)

        {

            Console.WriteLine(DateTime.Now.ToString("yyyyMMddHHmmssfffffff"));

            Console.WriteLine(DateTime.Now.ToString("yyyyMMddHHmmssfffffff"));

            Console.WriteLine(DateTime.Now.ToString("yyyyMMddHHmmssfffffff"));

            Console.WriteLine(DateTime.Now.ToString("yyyyMMddHHmmssfffffff"));

            Console.WriteLine(DateTime.Now.ToString("yyyyMMddHHmmssfffffff"));

            Console.WriteLine(DateTime.Now.ToString("yyyyMMddHHmmssfffffff"));

            Console.WriteLine(DateTime.Now.ToString("yyyyMMddHHmmssfffffff"));

            Console.WriteLine(DateTime.Now.ToString("yyyyMMddHHmmssfffffff"));

            Console.WriteLine(DateTime.Now.ToString("yyyyMMddHHmmssfffffff"));

            Console.WriteLine(DateTime.Now.ToString("yyyyMMddHHmmssfffffff"));

        }

    }

}