using System;

using System.Threading;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main()

    {

        Task t = Task.Run(() => {

            Thread.Sleep(1000); // fake lock

            Console.WriteLine("should not run");

        });

        t.Wait(500);

        Console.WriteLine("end");

        Thread.Sleep(2000);

    }

}