Anyone have any source or tutorial that i can use to create a multiplayer game based on LAN?

should i use winsock or another lib?

thx

If you're trying to avoid using the built-in XNA networking APIs, a lot of people seem to like Lidgren. I haven't used it myself, but I'd suggest at least taking a look at it. There's a tutorial for how to use it with XNA here: http://www.ziggyware.com/readarticle.php?article_id=168.

if im trying to use XNA network API where i can get tutorial or example about it?

There are quite a few samples for using the XNA networking API on this site: http://creators.xna.com/education/catalog/?contenttype=0&devarea=19&sort=1. Keep in mind to use the networking, the player must have a full installation of XNA Game Studio (and, because it is a prerequisite, Visual Studio). The networking APIs are considered "developer only" currently and are not included in the redistributable. So if you want this to be a game you share with people, you might want to use a separate API. If your goal is to work on something that will work on Xbox 360, or will just be played by you and a couple of developer friends, the networking APIs are really nice.

Nice,Thx.

looks like i will not choose XNA API coz i create the game for my final project in my campus

http://msdn.microsoft.com/en-us/library/bb975645.aspx