public override object?GetNthMask(int index)
            {
                Cell_FieldIndex enu = (Cell_FieldIndex)index;

                switch (enu)
                {
                default:
                    return(base.GetNthMask(index));
                }
            }
            public override void SetNthMask(int index, object obj)
            {
                Cell_FieldIndex enu = (Cell_FieldIndex)index;

                switch (enu)
                {
                default:
                    base.SetNthMask(index, obj);
                    break;
                }
            }
            public override void SetNthException(int index, Exception ex)
            {
                Cell_FieldIndex enu = (Cell_FieldIndex)index;

                switch (enu)
                {
                default:
                    base.SetNthException(index, ex);
                    break;
                }
            }