Best way to shutdown async socket

Hi

I'm writing some network program and made something that look like server. The problem is that I can not shut it down. The code looks like this:

CNetwork

{

void Start ()

{

<socket creation, binding, etc.....>

mSocket.BeginAccept(new AsyncCallback(AcceptConn),mSocket);

<code continue.......>

}

void Stop ()

{

if (mSocket.Connected)

mSocket.Shutdown (SocketShutdown.Both);

mSocket.Close();

mSocket = null;

<code continue......>

}

<code continue......>

}

Error ocures when: CNetowrk.Start() and immideatly CNetowrk.Stop(). It seems like when I creating socket and immideatly starting with BeginAccept I can not end this -> I just can't do socket.Close() and socket = null. The error:

System.InvalidOperationException with additional information: AcceptCallback

is thrown. Is there any way to end BeginAccept operation and shutdown the socket