tcp client listener .net

Question

Does anyone have any code snippets for .net tcp client listener?
I have a serial to ethernet device (a Digi) that is set up as the server, and when new information is sent to that device I want to retrieve it.
From what I understand this means the server is broadcasting anytime it gets new information and the client has to be listening all the time. Is this correct? Or can the listner be listening every 10 seconds or so?