using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

            Program p = new Program();

            Task[] tasks = new Task[2];

​

            Stopwatch sw = null;

            for (int i = 0; i < 10; i++)

            {

                sw = Stopwatch.StartNew();

                Parallel.Invoke(() => p.Gotosleep(), () => p.Gotosleep());

                string res = sw.Elapsed.ToString();

                Console.WriteLine("Parallel invoke results: " + res);

                sw.Stop();

            }

​

            for (int i = 0; i < 10; i++)

            {

                sw = Stopwatch.StartNew();

                tasks[0] = Task.Factory.StartNew(() => p.Gotosleep());

                tasks[1] = Task.Factory.StartNew(() => p.Gotosleep());

                Task.WaitAll(tasks);

                string res2 = sw.Elapsed.ToString();

                Console.WriteLine("Task wait all results: " + res2);

                sw.Stop();

            }

    }

    public Task Gotosleep()

    {

        return Task.Delay(3000);

    }

}