CSKernelClient.cUtil.listItemData_ C# (CSharp) Method

        private static long listItemData_(ComboBox list, int index)
        {
            long _rtn = 0;
            
            if (index < list.Items.Count)
            {
                if (index == -1)
                {
                    _rtn = listID_(list);
                }
                else
                {
                    _rtn = ((ListValueWithId)list.Items[index]).Id;
                }
            }
            return _rtn;
        }
        private static void listSetListIndex_(ComboBox list, int idx)