is it posible to use vb.net to write code to Arduino ? i know the serial port... but how do i send it code that makes sence for it?
Are you trying to make an Arduino program, written in C, interact with a VB.Net program, or to program the Arduino itself using the VB.Net Language ?
The first option should be really easy, you'll just have to listen/write to the serial port, which is just as easy as writing/listening to stdin (It should be, anyway. It is very easy on nx, but I know nothing about Windows developement)
But you can't program the Arduino using languages other than C/C++ and assembly language. If you want a language which relates to VB to program a microcontroller, you can give a look to Basic Stamps or PicBasic. I don't know a lot about them, but they're heavily documented in a book named "Physical Computing", published by Thomson Course Technology, and AFAIK available on line. There may be a lot of ressources on the web too, since they seem to be widely used.
Hope to have helped...