using System;

using System.Threading.Tasks;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Test().Wait();

    }

    private static async Task Test()

    {

        var nums = Enumerable.Range(1, 10);

        await Task.WhenAll(

                    nums

                        .Select(s =>

                            Write(s)

                        )

                        .ToArray());

    }

    private static async Task<bool> Write(int s){

        return await Task.Run(()=>{

        Console.WriteLine(s);

            return true;

        });

    }

}