private void privAddBefore(ref DLink pCur, DLink pNode)
{
// Will work for Active or Reserve List
Debug.Assert(pCur != null);
Debug.Assert(pNode != null);
DLink.AddBefore(ref this.poActive, ref pCur, pNode);
// worst case, pCur was null initially, now we added a node so... this is true
Debug.Assert(pCur != null);
}