Direct Cast or CType.

[cptHotkeys]

OK, I know this has been posted before so sorry, but anyway...

What is best to use in this senario...

Sub new(byref b as button)
    AddHandler b.MouseClick, AddressOf ButtonClick
End Sub

Private sub ButtonClick(byval sender as object, byval e as eventargs)
   Dim b as button = Ctype(sender, button)
   'or
   Dim b as button = DirectCast(sender, button)
   b.text = "blahblah"
end sub

Is Ctype only usable when converting an object to the same type while DirectCast can be used to convert an object to the same type or a Base type?

Thanks in advance...