this should fail. In old VB.

gistfile1.txt

Imports System.Dynamic



Module Module1

    Sub Main()

        Dim c2 As Object = New C

        Dim db2 As Object = New D

        c2.Join(db2.Address)

    End Sub



End Module



Class C : Inherits DynamicObject

    Public Overrides Function TryInvokeMember(binder As System.Dynamic.InvokeMemberBinder, args() As Object, ByRef result As Object) As Boolean

        If binder.Name = "Join" Then

            result = args(0) & args(0)

            Return True

        End If

        Return False

    End Function

End Class



Class D : Inherits DynamicObject

    Public Overrides Function TryGetMember(binder As System.Dynamic.GetMemberBinder, ByRef result As Object) As Boolean

        If binder.Name = "Address" Then

            result = "addr"

            Return True

        End If

        Return False

    End Function

End Class