private void acceptClient(IAsyncResult ar)
        {
            if (isDispose == true)
                return;

            Console.WriteLine("connect!" + Thread.CurrentThread.ManagedThreadId);

            Socket client = server.EndAccept(ar);

            //row버퍼 생성
            byte[] headerbuffrow = new byte[client.SendBufferSize];

            //row버퍼 삽입
            client.Receive(headerbuffrow);

            //row버퍼 크기 체크
            int headerByteCount = 0;
            for (int i = 0; i < headerbuffrow.Length; ++i)
            {
                if (headerbuffrow[i] > 0)
                {
                    ++headerByteCount;
                }
            }

            //row버퍼 크기만큼 실제 headerBuff 생성
            byte[] headerbuff = new byte[headerByteCount];
            for (int i = 0; i < headerbuff.Length; ++i)
            {
                 headerbuff[i] = headerbuffrow[i];
            }

            //읽기
            string readStr = Encoding.Default.GetString(headerbuff).TrimEnd();
            Console.WriteLine(readStr);
            Console.WriteLine("end!");

            client.Disconnect(false);
            client.Close();
        }