cannot see dll update in another vb.net project

hi all, i've created a dll with .net wich contains only members:
Public Class MyCls
Public Member1 As Date
Public Member2 As String
Public Member3 As String
Public Member4 As String
End Class

I created another project in wich i added a reference to the dll and all
seems to work fine.
Then i added other members to the dll, recompiled the dll project and
re-referenced the dll in the other project.

The problem is that i don't see the new members: does someone have an idea?
thanks.