System.Xml.XmlTextWriter.PopNamespaces C# (CSharp) Method

        private void PopNamespaces(int indexFrom, int indexTo) {
            Debug.Assert(useNsHashtable);
            for (int i = indexTo; i >= indexFrom; i--) {
                Debug.Assert(nsHashtable.ContainsKey(nsStack[i].prefix));
                if (nsStack[i].prevNsIndex == -1) {
                    nsHashtable.Remove(nsStack[i].prefix);
                }
                else {
                    nsHashtable[nsStack[i].prefix] = nsStack[i].prevNsIndex;
                }
            }
        }