I assume you mean a Character base lcd, these can be controlled two ways either by parallel port or by serial port. VB doesnt really allow you to utilize the parallel port. It may be possible to do it by api calls i'm not sure. The only true way is serial but it will require that you put a small controller to handle the serial inputs (i can remeber where i saw it but it is doable).
Your best shoot will be using a dll to handle the parallel communication, however my experience is that very few of the people that has made this type of code will make it available, however i know there is at least one, because i messed around with it.
However i wanted to do a bit more than the dll was able to handle (i wanted to use inputs on the parallele port, but reaction times where just to high)
i have one of the few available dlls, but i cant remember where i found it. i have two names you can search for directio01.dll and ximp. i believe this is the name of the site, i dont know where it is located but try searching for ximp, if you cant find it ill try'n make it avail to you