Async Multithreading, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;

namespace Rextester
{
    class Program
    {
        public static async Task Foo(int num)
        {
            Console.WriteLine("Thread {0} - Start {1}", Thread.CurrentThread.ManagedThreadId, num);

await Task.Delay(1000);

Console.WriteLine("Thread {0} - End {1}", Thread.CurrentThread.ManagedThreadId, num);
        }

public static List<Task> TaskList = new List<Task>();

public static void Main(string[] args)
        {
            for (int i = 0; i < 3; i++)
            {
                int idx = i;
                TaskList.Add(Foo(idx));
            }

Task.WaitAll(TaskList.ToArray());
            Console.WriteLine("Press Enter to exit...");
            Console.ReadLine();
        }
    }
}

Show compiler warnings [ - ] Show input
Compilation time: 0,16 sec, absolute running time: 1,11 sec, cpu time: 0,08 sec, average memory usage: 24 Mb, average nr of threads: 8