/// <summary>
        /// Callback for received data
        /// </summary>
        private void ReceiveCallback(IAsyncResult ar)
        {
            int len = -1;
            try
            {
                len = this.GetSocket().EndReceive(ar);
                if (len <= 0)
                    throw new Exception("Received " + len);
            }
            catch (Exception e)
            {
                if (ErrorEvent != null)
                    ErrorEvent(this, e);
                return;
            }
            AsyncObject obj = (AsyncObject)ar.AsyncState;
            int datLen = BitConverter.ToInt32(obj.byteArray, 0);
            byte[] dataArray = new byte[datLen];
            System.Buffer.BlockCopy(obj.byteArray, 4, dataArray, 0, datLen);
            // Handle dataArray
        }