//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 });

var pdfFormatProvider = new PdfFormatProvider();
pdfFormatProvider.ExportSettings.FontEmbeddingType = FontEmbeddingType.Full;

        /// <summary>
        /// Creates a TextBoxField with calculated font size for the given rectangle
        /// </summary>
        private static TextBoxField CreateTextBoxWithCalculatedFont(string name, string text, Rect rect, double fontSize, FontBase font)
        {
            TextBoxField field = new TextBoxField(name);
       
            field.TextProperties.FontSize = Unit.DipToPoint(fontSize);
            field.TextProperties.Font = font;
            field.Value = text;

            var widget = field.Widgets.AddWidget();
            widget.Rect = rect;
            widget.Border.Width = 0;
            widget.TextProperties.FontSize = Unit.DipToPoint(fontSize); 
            widget.TextProperties.Font = font;

            return field;
        }

        /// <summary>
        /// Calculates the optimal font size for text to fit within a specific rectangle
        /// </summary>
        public static double CalculateFontSizeForRectangle(string text, Rect rect, FontBase font)
        {
            double fontSize = 0;
            Size measuredSize = new Size(0, 0);
            Size availableSize = rect.Size;
            while (measuredSize.Width<availableSize.Width && measuredSize.Height< availableSize.Height)
            {
                fontSize++;
                Block block = new Block();
                block.TextProperties.FontSize = fontSize;
                block.TextProperties.Font = font;
                block.InsertText(text);
                measuredSize = block.Measure();
            }

            return fontSize-1;
        }

            // Example: Wide textbox with calculated font size
            string wideText = "This is a wide textbox that demonstrates horizontal fitting of text content.";
            Rect wideRect = new Rect(200, 500, 400, 30);
            double wideFontSize = CalculateFontSizeForRectangle(wideText, wideRect, font);

            TextBoxField wideTextBoxField = CreateTextBoxWithCalculatedFont("WideTextBox", wideText, wideRect, wideFontSize, font);
            document.AcroForm.FormFields.Add(wideTextBoxField);
            var wideWidget = wideTextBoxField.Widgets.First();
            page.Annotations.Add(wideWidget);
            wideWidget.RecalculateContent();