private string GetAncestorValue(string ancestorKeyName)
        {
            string sAncestorDelimitedString = string.Empty;

            if (Ancestors.ContainsKey(
                    ancestorKeyName))
            {
                Ancestors.TryGetValue(
                    ancestorKeyName, out sAncestorDelimitedString);
            }
            return(sAncestorDelimitedString);
        }