public boolean containsCell(int rowIndex, int columnIndex) {if (columnIndex < _firstColumnIndex) {return false;}if (columnIndex > _lastColumnIndex) {return false;}if (rowIndex < _firstRowIndex) {return false;}if (rowIndex > _lastRowIndex) {return false;}return true;}
public bool ContainsCell(int rowIndex, int columnIndex){if (columnIndex < _firstColumnIndex){return false;}if (columnIndex > _lastColumnIndex){return false;}if (rowIndex < _firstRowIndex){return false;}if (rowIndex > _lastRowIndex){return false;}return true;}