wp7:msdn上的socket类，改写后发现有关问题，求解决

public string Receive()
        {

            string response = "";

            // We are receiving over an established socket connection
            if (_socket != null)
            {
                // Create SocketAsyncEventArgs context object
                SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs();
                socketEventArg.RemoteEndPoint = _socket.RemoteEndPoint;

                // Setup the buffer to receive the data
                socketEventArg.SetBuffer(new Byte[MAX_BUFFER_SIZE], 0, MAX_BUFFER_SIZE);

                // Inline event handler for the Completed event.
                // Note: This even handler was implemented inline in order to make this method self-contained.
                socketEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(delegate(object s, SocketAsyncEventArgs e)
                {
                    if (e.SocketError == SocketError.Success)
                    {
                        // Retrieve the data from the buffer
                        response = Encoding.UTF8.GetString(e.Buffer, e.Offset, e.BytesTransferred);
                        response = response.Trim('\0');                        

                    }
                    else
                    {                 
                       response = e.SocketError.ToString();                         
                    }

                    _clientDone.Set();
                });

                // Sets the state of the event to nonsignaled, causing threads to block
                _clientDone.Reset();

                // Make an asynchronous Receive request over the socket
                _socket.ReceiveAsync(socketEventArg);

                // Block the UI thread for a maximum of TIMEOUT_MILLISECONDS milliseconds.
                // If no response comes back within this time then proceed
                _clientDone.WaitOne(TIMEOUT_MILLISECONDS);
            }
            else
            {
                response = "Socket is not initialized";
            }

            return response;
        }