Tic Tac Toe for 2 players (TCP/IP)

Question

Hi,

I'm a beginner to C# programming so what day I set a mission to create a tic tac toe game which will be using TCP/IP protocol to provide 2 players game... After some time I've made some shitty (in my opinion) code, and I haven't been able to implement TCP server/client connection :( So there is only game for 2 playes on 1 computer, you can also choose between 3x3 and 4x4 board... I think my code is messy... So I want you to check it, share your pro opinion, give some tips what to improve, upgrade etc.

Andd for the most important... I need some one to direct me, how to solve the network game, how to implement it... I've read some tutorials but I'm too noooby to create it by my self, so I need a little help :) and some of your time.

HERE's the link to my project: http://rapidshare.com/files/182138769/test.rar.html

Thanks

Greg.