public Object OriginalValue { get; }

Public ReadOnly Property OriginalValue As Object

The ChangeTracker.Changes collection represents accumulated changes since the entity was last saved. For ChangedValue objects in this collection, the OriginalValue will therefore be the value at the time the entity was last saved. A ChangeTrackedEventArgs represents the tracking of an individual change. In this case, the OriginalValue will be the value before the change, which may be different from the value at last save if a property is changed multiple times.