Edit and Continue (Visual Basic): External Declarations Edits
This topic applies to:
Pro, Premium, and Ultimate
In general, you cannot change the declarations of external methods during Edit and Continue. Specifically, Edit and Continue does not support the following changes:
Adding or removing an external declaration.
Changing the signature or marshalling attributes of an external declaration.
If you want to make one of these changes, you must stop debugging and recompile your project.