Represents the state of the entity relative to the unit of work.
The object exists but is not being tracked. An entity is in this state immediately after it has been created and before it is added to the unit of work. An entity is also in this state after it has been removed from the unit of work by calling the IUnitOfWork.Detach method.
The object has not been modified since it was attached to the unit of work or since the last time that the IUnitOfWork.SaveChanges method was called.
The object has been deleted from the unit of work. After the changes are saved, the object state changes to EntityState.Detached.
One of the scalar properties on the object has been modified and the IUnitOfWork.SaveChanges method has not been called. After the changes are saved, the object state changes to EntityState.Unchanged.