How to convert worksheet to PDF in WinForms XIsIO?

using (ExcelEngine excelEngine = new ExcelEngine())
{
    IApplication application = excelEngine.Excel;
    application.DefaultVersion = ExcelVersion.Excel2016;
 
    IWorkbook workbook = application.Workbooks.Open("../../Data/Sample.xlsx");
 
    // Load the first worksheet into ExcelToPdfConverter
    ExcelToPdfConverter converter = new ExcelToPdfConverter(workbook.Worksheets[0]);
 
    // Define ExcelToPdfConverterSettings
    ExcelToPdfConverterSettings settings = new ExcelToPdfConverterSettings();
    settings.DisplayGridLines = GridLinesDisplayStyle.Visible;
    settings.LayoutOptions = LayoutOptions.FitAllColumnsOnOnePage;
 
    // Convert the first worksheet to PDF with converter settings
    PdfDocument document = converter.Convert(settings);
 
    //Now load the second worksheet into ExcelToPdfConverter
    converter = new ExcelToPdfConverter(workbook.Worksheets[1]);
 
    // Have ExcelToPdfConverterSettings               
    settings = new ExcelToPdfConverterSettings();
    //Note: Assigning the document to TemplateDocument in converter settings is mandatory
    //This will carry over the already converted worksheets
    settings.TemplateDocument = document;
    settings.DisplayGridLines = GridLinesDisplayStyle.Visible;
 
    // Convert the second worksheet to PDF with converter settings
    document = converter.Convert(settings);
 
    // Now load third worksheet into ExcelToPdfConverter
    converter = new ExcelToPdfConverter(workbook.Worksheets[2]);
 
    // Have ExcelToPdfConverterSettings               
    settings = new ExcelToPdfConverterSettings();
    // Note: Assigning the document to TemplateDocument in converter settings is mandatory
    // This will carry over the already converted worksheets
    settings.TemplateDocument = document;
    settings.DisplayGridLines = GridLinesDisplayStyle.Invisible;
    settings.LayoutOptions = LayoutOptions.FitSheetOnOnePage;
 
    // Convert the third worksheet to PDF with converter settings
    document = converter.Convert(settings);
 
    // Save the PDF
    document.Save("Output.pdf");
    System.Diagnostics.Process.Start("Output.pdf");
}