Why isn't Megaman in a Castlevania game?

[richardhutnik]

blaydcor said:

I mean come on they are both NES sidescrollers. Plus if that's what a whip does to vampires, imagine the megabuster :-0 Plus then you could fight Shademan.

Let's see.  Isn't Castlevania by Konami, while Megaman is by Capcom? 

Anyone see this crossover ever happening?