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Edit and Continue (Visual Basic): Interface Definition Edits
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While you are frequently allowed to make changes to members that implement interfaces, changes to the actual interface definitions are generally not allowed by Edit and Continue. Specifically, Edit and Continue does not support the following changes:
Defining a new interface.
Adding, changing, or removing interface members.
Deleting an existing interface.
Changing the access modifier of an interface.
Changing the interface inheritance hierarchy.
If you want to make one of these changes, you must stop debugging and recompile your project.