I would say both because booKill is boolean and doesn't really guarantee anything about _bb. Unless you cannot do anything to fix it, because then a try..catch is most of the time just useless.
If booKill = False Then
Try
_bbg = Me.CreateGraphics
_bbg.DrawImageUnscaled(_bb, 0, 0)
Catch ...
Fix code...
End Try
End If
Good luck!