Socket objectDisposedException

Hi, in my program I've 2 threads, 1 to handle socket connections and other to do background processing. The problems is that when I close a socket in the background thread (thread 2), then thread 1 throws the System.ObjectDisposedException for the socket in ReadCallBack procedure.

I've made a handler to catch the execption, but I want to know if there is a better way to avoid this exception? Why closing the socket in another thread causes this exception, I'm using SocketShutdown.Both before Close?

Thanks in advance