using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        foreach(int id in Enumerable

                .Range(1,100)

                .AsParallel()

                .WithDegreeOfParallelism(1)

                .Select(i => System.Threading.Thread.CurrentThread.ManagedThreadId).Distinct())

        {

            Console.WriteLine(id);

        }

    }

​

}

​