using System;

using System.Threading.Tasks;

using System.Linq;

using System.Diagnostics;

public class Program

{

    static Stopwatch sw;

    public static bool Init()

    {

        var series = Enumerable.Range(1, 5).ToList();

        foreach (var i in series)

        {

            Console.WriteLine("{0} Starting Process {1}", sw.ElapsedMilliseconds, i);

            DoWorkAsync(i);

            Console.WriteLine("{0} Ending Process {1}", sw.ElapsedMilliseconds, i);

        }

        return true;

    }

​

    public static async Task<Tuple<int, bool>> DoWorkAsync(int i)

    {

        Console.WriteLine("{0} working..{1}", sw.ElapsedMilliseconds, i);

        await Task.Delay(1000);

        Console.WriteLine("{0} finishing..{1}", sw.ElapsedMilliseconds, i);

        return Tuple.Create(i, true);

    }

    public static void Main()

    {

        sw = Stopwatch.StartNew();

        var task = Init();

        Console.WriteLine("{0} Test result was " + (task ? "t" : "f"), sw.ElapsedMilliseconds);

    }

}