using System;

using System.Threading.Tasks;

using System.Linq;

public class Program

{

    public static async Task<bool> Init()

    {

        Random r = new Random();

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

        var tasks = new System.Collections.Generic.List<Task<Tuple<int, bool>>>();

        foreach (var i in series)

        {

            int delay = r.Next(1000,10000);

            Console.WriteLine("Starting Process {0} for {1}", i, delay);

            tasks.Add(DoWorkAsync(i, delay));

        }

        foreach (var task in await Task.WhenAll(tasks))

        {

            if (task.Item2)

            {

                Console.WriteLine("Ending Process {0}", task.Item1);

            }

        }

        return true;

    }

​

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

    {

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

        await Task.Delay(delay);

        return Tuple.Create(i, true);

    }

    public static void Main()

    {

        var task = Init();

        Console.WriteLine("Test result was " + (task.Result ? "t" : "f"));

    }

}