asd

    using System;
    using System.Collections.Generic;
    using System.Threading;

    namespace VPS5.LimitedConnectionsExample {
        public class LimitedConnectionsExample {

            private static Semaphore pool;
            private static int _padding;

            public static void DownloadFilesAsync(IEnumerable<string> urls) {
                pool = new Semaphore(0, 10);
                foreach (var url in urls) {
                    Thread t = new Thread(DownloadFile);
                    t.Start(url);
                }
                pool.Release(10);

            }
            public static void DownloadFile(object url) {
                Console.WriteLine("Thread {0} begins " + "and waits for the semaphore.", (string)url);
                pool.WaitOne();
                int padding = Interlocked.Add(ref _padding, 100);
                Console.WriteLine("Thread {0} enters the semaphore.", (string)url);
                Thread.Sleep(1000 + padding);
                Console.WriteLine("Thread {0} releases the semaphore.", (string)url);
                pool.Release();
            }

            public static void Main() {
                IList<String> urls = new List<String>();

                for (int i = 1; i < 12; i++) {
                    urls.Add(i.ToString());
                }
                DownloadFilesAsync(urls);
            }
        }
    }