public override String ToString(){StringBuilder sb = new StringBuilder(64);CellReference crA = new CellReference(_firstRowIndex, _firstColumnIndex, false, false);CellReference crB = new CellReference(_lastRowIndex, _lastColumnIndex, false, false);sb.Append(GetType().Name);sb.Append(" [").Append(crA.FormatAsString()).Append(':').Append(crB.FormatAsString()).Append("]");return sb.ToString();}