using System;
using System.IO;
using System.Threading.Tasks;

namespace IOTest
{
    class Program
    {
        static void Main(string[] args)
        {
            for (int i = 0; i < 1000; i++)
            {
                Task.Run(() =>
                {
                    using (FileStream s = new FileStream(@"D:\aaa\a" + i, FileMode.Create))
                    {
                        s.Write(new byte[] {}, 0, 0);
                    }
                });
            }
            Console.ReadKey();
        }
    }
}