Binary Compatibility Changes for Visual Basic 6.0 Users
Visual Basic 2008 updates the mechanism for preserving compatibility with older versions of a component.
Binary Compatibility
Visual Basic 6.0
In Visual Basic 6.0, the Binary Compatibility option allows you to automatically retain class and interface identifiers from a previous version of a component when you compile a new version. The new version contains both the old identifiers and the new identifiers, and client applications can continue using the old interface to your component without having to be updated.
Visual Basic 2008
In Visual Basic 2008, binary compatibility is accomplished using attributes. This gives you direct control over the information placed in your compiled component, such as class and interface identifiers, virtual table offsets, and any appropriate COM attributes. Because you can explicitly select attributes for preservation, the Binary Compatibility option of Visual Basic 6.0 is not supported.
See Also
Concepts
Attributes Overview in Visual Basic
Attributes Used in Visual Basic
Global Attributes in Visual Basic
Programming Element Support Changes Summary