using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace TestTestTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var list = new SortedList<string, FileInfo>();
            foreach (var name in Directory.GetFiles("C:\\WINDOWS"))
            {
                list.Add(name, new FileInfo(name));
            }

            Action a = () =>
            {
                while (true)
                {
                    foreach (var kvp in list)
                    {
                        Console.WriteLine("Action=A:{0}", kvp.Value.Name);
                    }
                }
            };

            Action b = () =>
            {
                while (true)
                {
                    for (int i = 0; i < list.Count; i++)
                    {
                        Console.WriteLine("Action=B:{0}", list[list.Keys[i]].Name);
                    }
                }
            };

            for (int i = 0; i < 25; i++ )
            {
                Task.Factory.StartNew(a);
                Task.Factory.StartNew(b);
            }
            Thread.Sleep(600 * 1000);
        }
    }
}