System.Data.DataViewListener.RegisterListChangedEvent C# (CSharp) Method

        internal void RegisterListChangedEvent(Index index)
        {
            Debug.Assert(null == _index, "DataviewListener already registered index");
            _index = index;
            if (null != index)
            {
                lock (index)
                {
                    index.AddRef();
                    index.ListChangedAdd(this);
                }
            }
        }