public boolean containsCell(BookSheetKey key, int rowIndex, int columnIndex) {BlankCellSheetGroup bcsg = _sheetGroupsByBookSheet.get(key);if (bcsg == null) {return false;}return bcsg.containsCell(rowIndex, columnIndex);}
public bool ContainsCell(BookSheetKey key, int rowIndex, int columnIndex){BlankCellSheetGroup bcsg = (BlankCellSheetGroup)_sheetGroupsByBookSheet[key];if (bcsg == null){return false;}return bcsg.ContainsCell(rowIndex, columnIndex);}