Your application uses Entity Framework with POCO entities without change-tracking proxy objects. You need to take a snapshot of an entity's property values for subsequent change detection.

What should you do?

The DetectChanges method ensures that ObjectStateEntry changes are synchronized with changes in all objects that the ObjectStateManager tracks.

ObjectStateManager methods can be used to get an entity object state and current and original property values. Its TryGetObjectStateEntry method cannot be used to detect changes in objects in which tracking in not enabled unless the DetectChanges method is called first.