Depends on the school of thought your into.

If you believe the reason that vampires cannot be photographed or cast a reflection in a mirror is due to the absence of the soul then you can reasonable assume they cannot cast shadows (as shadows can be seen as representation of souls - think Peter Pan).

Otherwise sure they can cast a shadow! They are still a human body even if a demon is inside of it. For that matter they could always cast a reflection of what the demon looks like instead of their human form in shadows.

That makes sense I was thinking they couldnt because they didnt have reflections so it had to be kind of the same thing.
Thank you so much =)

I think it depends on which myths/legends you draw from. Most everything I've read, they cast a shadow, but don't have a reflection.

I never even thought about vamps having shadows before lol. So I could go either way? That will definitely work for my story thank you =)

doesn't Alucard step into his shadow to shadow walk?

I have know idea who Alucard is LOL