public ObjectReference Bind2(Transaction trans, ObjectReference oldRef, object obj
)
{
int id = oldRef.GetID();
trans.RemoveReference(oldRef);
ObjectReference newRef = new ObjectReference(ClassMetadataForObject(obj), id);
newRef.SetObjectWeak(this, obj);
newRef.SetStateDirty();
trans.ReferenceSystem().AddExistingReference(newRef);
return newRef;
}