.net Detect disconnect with ReceiveAsync

Question

Well as the title says how can i detect a disconnect with "ReceiveAsync" with all other .net network patterns you could just look if you recived 0 bytes or if any exception was throw however this does not seem to be true any more with this pattern...

My first recive return 0 bytes but the second works thats why im confused....

Answer 1

It's just the same:

        void OnReceiveComplete(IAsyncResult iar)
        {
            try
            {
                int count = sock.EndReceive(iar);
                if (count == 0)
                {
                    Console.WriteLine("{0} closed by remote host", ID);
                    sock.Close();
                }
                else
                {
                    int total = Interlocked.Increment(ref totalBytes);
                    Console.WriteLine("{0} received {1} (total: {2})",
                        ID, buff[0], total);
                    StartReceive();
                }
            }
            catch (Exception x)
            {
                Console.WriteLine("{0} error from EndReceive: {1}", ID, x);
            }
        }