Port Forwarding

Hi guys, I'm trying to make my program forward port 2303 for UDP so that my game will work without the user having to forward their ports manually every time they want to play.

Does anyone have any idea how I could do this?

I've searched and come across this C# code but I keep having problems converting it to VB.Net:
http://www.thescripts.com/forum/thread431643.html

Thanks in advance,
knxrb

Rather than just saying that you have problems, if you tell us what those problems are then we may be able to help with them.