text: public override String ToString(){CellReference cr = new CellReference(Row, Column, !IsRowRelative, !IsColRelative);StringBuilder sb = new StringBuilder();sb.Append(GetType().Name);sb.Append(" [");sb.Append("sheetIx=").Append(ExternSheetIndex);sb.Append(" ! ");sb.Append(cr.FormatAsString());sb.Append("]");return sb.ToString();}