using System;

using System.Threading;

using System.Threading.Tasks;

using System.Collections.Generic;

​

public class Program

{

    private static String lastCommandInput = "";

    public static void Main()

    {

        var m = new Manager();

        m.init();

        Console.WriteLine("Main finished. ThreadID: " + Thread.CurrentThread.ManagedThreadId);

    }

    public class Manager

    {

        public void init()

        {

            Console.WriteLine("Starting up... ThreadID: " + Thread.CurrentThread.ManagedThreadId);

            var tasks = new List<Task>();

            tasks.Add(Task.Run(() => DoThingAsync(3)));

            tasks.Add(Task.Run(() => DoThingAsync(2)));

            tasks.Add(Task.Run(() => DoThingAsync(1)));

            Console.WriteLine("Started up! ThreadID: " + Thread.CurrentThread.ManagedThreadId);

            bool finished = false;

            while (!finished)

            {

                finished = true;

                foreach (Task t in tasks)

                {

                    if (!t.IsCompleted)

                        finished = false;

                }

                Thread.Sleep(16);

            }

        }

        private async void DoThingAsync(int seconds)

        {

            Console.WriteLine("Waiting " + seconds + " seconds... ThreadID: " + Thread.CurrentThread.ManagedThreadId);

            await Task.Delay(seconds * 1000);

            Console.WriteLine(seconds + " seconds over! ThreadID: " + Thread.CurrentThread.ManagedThreadId);

        }

    }

}