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The InvalidOperationException in DbContext usually occurs when a specific operation is not valid for the current state of the context. It usually means that the context is in an invalid state and cannot perform the requested action. This may be due to various reasons such as trying to update a disconnected entity, calling SaveChanges on a read-only context, or trying to add an entity with a primary key that already exists in the database. The exact cause of the exception can be determined from the error message and stack trace provided. To resolve this exception, you may need to check the current state of the DbContext and its entities, and ensure that you are using the correct method or operation that is suitable for the context's current state.