Sockets BeginConnect Pass String?

Q: Can I 'pass' a string in place of the 'null' param in the Sockets.BeginConnect method?
Q. If so, how do I retreived the string in the next method?

I generally find the state object either null or the actual socket name.

clientSocket.BeginConnect(ipEndPoint, new AsyncCallback(OnConnect), null);

 private void OnConnect(IAsyncResult ar)
 {
     clientSocket.EndConnect(ar);              
     clientSocket.BeginSend(data, 0, data.Length, SocketFlags.None, new AsyncCallback(OnSend), null);
  }