//Step 1: Create an instance of XlsxFormatProvider to import the Excel file
            XlsxFormatProvider xlsxFormatProvider = new XlsxFormatProvider();
            Telerik.Windows.Documents.Spreadsheet.FormatProviders.Pdf.PdfFormatProvider pdfFormatProvider = new Telerik.Windows.Documents.Spreadsheet.FormatProviders.Pdf.PdfFormatProvider();

            Workbook workbook;
            using (FileStream input = new FileStream("Input.xlsx", FileMode.Open))
            {
                workbook = xlsxFormatProvider.Import(input, TimeSpan.FromSeconds(10));
            }

            //Step 2: Export the workbook to PDF RadFixedDocument to modify fonts
            Telerik.Windows.Documents.Spreadsheet.FormatProviders.Pdf.PdfFormatProvider spread_pdf_provider = new Telerik.Windows.Documents.Spreadsheet.FormatProviders.Pdf.PdfFormatProvider();
            RadFixedDocument fixedDocument = spread_pdf_provider.ExportToFixedDocument(workbook, TimeSpan.FromSeconds(10));

            foreach (var page in fixedDocument.Pages)
            {
                foreach (var content in page.Content)
                {
                    if (content is TextFragment text)
                    {
                        // Replace the font with Helvetica or HelveticaBold based on the original font style
                        text.Font = text.Font.Name.ToLower().Contains("bold")
                            ? FontsRepository.HelveticaBold
                            : FontsRepository.Helvetica;
                    }
                }
            }

            //Step 3: Save the modified RadFixedDocument back to PDF
            string outputFileName = "ExportedWorkbook.pdf";
            Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider fixed_pdf_provider = new Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider();
            using (FileStream output = new FileStream(outputFileName, FileMode.Create))
            {
                fixed_pdf_provider.ExportSettings.DocumentUnhandledException += ExportSettings_DocumentUnhandledException;
                fixed_pdf_provider.ExportSettings.FontEmbeddingType = Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Export.FontEmbeddingType.Subset;
                fixed_pdf_provider.Export(fixedDocument, output, TimeSpan.FromSeconds(10));
            }
            Process.Start(new ProcessStartInfo() { FileName = outputFileName, UseShellExecute = true });

WorksheetPageSetup pageSetup = workbook.ActiveWorksheet.WorksheetPageSetup;
pageSetup.PrintTitles.RepeatedRows = null;
pageSetup.PrintTitles.RepeatedColumns = null;