using System;

using System.Collections.Generic;

using System.Threading.Tasks;

using System.Threading;

public class Program

{

    public static void Main()

    {

        // it will not sleep

        Console.WriteLine(DateTime.Now);

        Task.Run(() => Thread.Sleep(1000 * 30));

        Console.WriteLine(DateTime.Now);

        Console.WriteLine();

        // it will sleep

        Console.WriteLine(DateTime.Now);

        Thread.Sleep(2 * 1000);

        Console.WriteLine(DateTime.Now);

    }

}

​