Managing Threads in threading

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Net;
 

namespace LabEx1
{
    class Program
    {
        static void Main(string[] args)
        {
            AutoResetEvent[] waitHandles = new AutoResetEvent[urls.length];
 
            int i = 0;
            foreach (string url in urls)
            {
                waitHandles[i] = new AutoResetEvent(false);
                ThreadInfo ti = new ThreadInfo(url, waitHandles[i]);
                ThreadPool.QueueUserWorkItem(getPage, ti);
                i++;
 
                waitHandles.waitAll(waitHandles);
            }
        }
        class ThreadInfo
        {
            public string url;
            public AutoResetEvent are;
 
            public ThreadInfo(string _url, AutoResetEvent _are)
            {
                url = _url;
                are = _are;
            }
            static void getPage(object data)
            {
                ThreadInfo ti = (ThreadInfo)data;
                WebResponse wr = WebRequest.Create(ti.url).GetResponse();
                Console.WriteLine(ti.url + ": " + wr.Headers["Content-Length"]);
                wr.Close();
                ti.are.Set();
            }
        }
    }
}