using System;
using System.Diagnostics;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
class Test
{
    static void Main()
    {
        using (Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
        
 
using (Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
        {
            listener.Bind(new IPEndPoint(IPAddress.Loopback, 0));
            listener.Listen(1);

            Task connectTask = Task.Run(() => client.Connect(listener.LocalEndPoint));
            
 
using (Socket server = listener.Accept())
            {
                connectTask.Wait();

                using (var clientAre = new AutoResetEvent(false))
                using (var clientSaea = new SocketAsyncEventArgs())
                using (var serverAre = new AutoResetEvent(false))
                
 
using (var serverSaea = new SocketAsyncEventArgs())
                {
                    byte[] sendBuffer = new byte[1000];
                    clientSaea.SetBuffer(sendBuffer, 0, sendBuffer.Length);
                    clientSaea.Completed += delegate { clientAre.Set(); };

                    byte[] receiveBuffer = new byte[1000];
                    serverSaea.SetBuffer(receiveBuffer, 0, receiveBuffer.Length);
                    serverSaea.Completed += delegate { serverAre.Set(); };

                    var sw = new Stopwatch();
                    int gen0 = GC.CollectionCount(0), gen1 = GC.CollectionCount(1), gen2 = GC.CollectionCount(2);
                    sw.Start();

                    for (int i = 0; i < 1_000_000; i++)
                    {
                        if (client.SendAsync(clientSaea)) clientAre.WaitOne();
                        if (clientSaea.SocketError != SocketError.Success) throw new SocketException((int)clientSaea.SocketError);

                        if (server.ReceiveAsync(serverSaea)) serverAre.WaitOne();
                        if (serverSaea.SocketError != SocketError.Success) throw new SocketException((int)clientSaea.SocketError);
                    }

                    Console.WriteLine($"Elapsed={sw.Elapsed} Gen0={GC.CollectionCount(0) - gen0} Gen1={GC.CollectionCount(1) - gen1} Gen2={GC.CollectionCount(2) - gen2}");
                }
            }
        }
    }
}