using System;

using System.Threading.Tasks;

​

namespace ConsoleApp1

{

    class Program

    {

        public class AsyncTest {

​

            public async Task Run()

            {

                var rand = new Random();

​

                var listOf10Tasks1 = new Task<int>[]

                {

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                };

​

                var listOf10Tasks2 = new Task<int>[]

                {

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                    Task.Delay(TimeSpan.FromSeconds(rand.Next(0, 6))).ContinueWith((_) => rand.Next(0, 11)),

                };

​

​

                var Times10TaskTasks = new Task<int[]>[]

                {

                    Task.WhenAll(listOf10Tasks1),

                    Task.WhenAll(listOf10Tasks1)

                };

​

                await Task.WhenAll(Times10TaskTasks).ContinueWith(async (intss) =>

                {

                    foreach (var ints in await intss)

                    {

                        Console.WriteLine($"{string.Join(", ", ints)}");

                    }

​

                });

            }    

        }

​

        static void Main(string[] args)

        {

            var asyncTest = new AsyncTest();

            asyncTest.Run().Wait();

        }

    }

}

​