Subclassing Socket

[Echilon]

I'm trying to use sockets to create a proxy connection to a server. The whole thing worked perfectly until I tried to add a custom class to deal with the proxy (authentication etc). I have two sockets, ListeningSocket and DataSocket. The problem is that I can't see to get listeningsocket to accept datasocket as a ProxySocket, only as a standard socket. ProxySocket extends Socket, but I can't get it to work. Here's the code: In the head of the class private ProxySocket dataSocket = null; private Socket listeningSocket = null; // used to accept active connections The in the method to accept the connection. listeningSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); listeningSocket.Bind(localEnd); listeningSocket.Listen(1); Socket dataSockTemp = listeningSocket.Accept(); // at this point, dataSockTemp is a connected Socket (shown via a breakboint) dataSocket = dataSockTemp as ProxySocket; listeningSocket.Close(); I'd really appreciate any help.