public boolean equals(Object obj) {if (!(obj instanceof BookSheetKey)) {return false;}BookSheetKey other = (BookSheetKey) obj;return _bookIndex == other._bookIndex && _sheetIndex == other._sheetIndex;}
public override bool Equals(Object obj){BookSheetKey other = (BookSheetKey)obj;return _bookIndex == other._bookIndex && _sheetIndex == other._sheetIndex;}