using System;

using System.Threading;

using System.Threading.Tasks;

using System.Linq;

using System.Collections.Generic;

using System.Diagnostics;

public class Program

{

    public static void Main()

    {

        /*var tasks = new List<Task>();

        for(int i=0;i<5;i++)

        {

            tasks.Add(MyMethod(i));

        }

        Task.WaitAll(tasks.ToArray());

        */

        Console.WriteLine("Main on Thread " + Thread.CurrentThread.ManagedThreadId);

        var sw = new Stopwatch();

        sw.Start();

        var m = Enumerable.Range(0, 5).Select(i => MyMethod(i)).ToList();

        Task.WaitAll(m.ToArray());

        sw.Stop();

        Console.WriteLine(sw.ElapsedMilliseconds);

        Console.WriteLine("Task.Run");

        sw = new Stopwatch();

        sw.Start();

        var l = Enumerable.Range(0, 5).Select(i => Task.Run(()=>MyMethod(i))).ToList();

        //var name = Console.ReadLine();

        Task.WaitAll(l.ToArray());

        sw.Stop();

        Console.WriteLine(sw.ElapsedMilliseconds);

        Console.WriteLine("Main on Thread " + Thread.CurrentThread.ManagedThreadId);

    }

    private static async Task MyMethod(int i) {

        Console.WriteLine(i + " on Thread " + Thread.CurrentThread.ManagedThreadId);    

        await Task.Delay(1000); // Mixed with "pseudo" async

        Console.WriteLine(i + " on Thread " + Thread.CurrentThread.ManagedThreadId);

    }

}