using System;

using System.Threading;

using System.Threading.Tasks;

using System.Collections.Generic;

public class Program

{

    public static async Task Main()

    {

        var tasks = new List<Task>();

        tasks.Add(Task.Run(() => Tester.ThrowWhen3(1)));

        tasks.Add(Task.Run(() => Tester.ThrowWhen3(2)));

        tasks.Add(Task.Run(() => Tester.ThrowWhen3(3)));

        tasks.Add(Task.Run(() => Tester.ThrowWhen3(4)));

        tasks.Add(Task.Run(() => Tester.ThrowWhen3(5)));

        tasks.Add(Task.Run(() => Tester.ThrowWhen3(6)));

        Task t = Task.WhenAll(tasks.ToArray());

        await t;

    }

    public static class Tester

    {

        public static void ThrowWhen3(int x) 

        {

            if(x == 3) throw new Exception("throw for " + x);

            Console.WriteLine(x);

        }

    }

}