    private void createPdfButton_Click(object sender, EventArgs e)
    {
        // Create a PDF document
        Document pdfDocument = new Document();

        // Set license key received after purchase to use the converter in licensed mode
        // Leave it not set to use the converter in demo mode
        pdfDocument.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

        // Add a page to PDF document
        PdfPage pdfPage = pdfDocument.AddPage();

        Cursor = Cursors.WaitCursor;
        string outPdfFile = @"DemoAppFiles\Output\PDF_Creator\File_Links.pdf";
        try
        {
            // The titles font used to mark various sections of the PDF document
            PdfFont titleFont = pdfDocument.AddFont(new Font("Times New Roman", 10, FontStyle.Bold, GraphicsUnit.Point));
            PdfFont subtitleFont = pdfDocument.AddFont(new Font("Times New Roman", 8, FontStyle.Regular, GraphicsUnit.Point));

            // The links text font
            PdfFont linkTextFont = pdfDocument.AddFont(new Font("Times New Roman", 8, FontStyle.Bold, GraphicsUnit.Point));
            linkTextFont.IsUnderline = true;

            float xLocation = 5;
            float yLocation = 5;

            // Add document title
            TextElement titleTextElement = new TextElement(xLocation, yLocation, "Create File Links in PDF Document", titleFont);
            AddElementResult addElementResult = pdfPage.AddElement(titleTextElement);

            yLocation = addElementResult.EndPageBounds.Bottom + 15;

            // Make a text in PDF a link to an external file

            // Add the text element
            string text = "Click this text to open an external file!";
            float textWidth = linkTextFont.GetTextWidth(text);
            TextElement linkTextElement = new TextElement(xLocation, yLocation, text, linkTextFont);
            linkTextElement.ForeColor = Color.Navy;
            addElementResult = pdfPage.AddElement(linkTextElement);

            // Create the file link element having the size of the text element
            RectangleF linkRectangle = new RectangleF(xLocation, yLocation, textWidth, addElementResult.EndPageBounds.Height);
            string filePath = @"..\..\Input\Attach_Files\Linked_External_File.txt";
            FileLinkElement fileLink = new FileLinkElement(linkRectangle, filePath);

            // Add the file link to PDF document
            pdfPage.AddElement(fileLink);

            yLocation = addElementResult.EndPageBounds.Bottom + 10;

            // Make an image in PDF a link to an external file

            TextElement subtitleTextElement = new TextElement(xLocation, yLocation, "Click the image below to open an external file:", subtitleFont);
            addElementResult = pdfPage.AddElement(subtitleTextElement);

            yLocation = addElementResult.EndPageBounds.Bottom + 5;

            // Add the image element
            ImageElement linkImageElement = new ImageElement(xLocation, yLocation, 120, @"DemoAppFiles\Input\Images\logo.jpg");
            addElementResult = pdfPage.AddElement(linkImageElement);

            // Create the file link element having the size of the image element
            linkRectangle = addElementResult.EndPageBounds;
            fileLink = new FileLinkElement(linkRectangle, filePath);

            // Add the file link to PDF document
            pdfPage.AddElement(fileLink);

            // Save the PDF document in a memory buffer
            byte[] outPdfBuffer = pdfDocument.Save();

            // Write the memory buffer in a PDF file
            System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer);
        }
        catch (Exception ex)
        {
            // The PDF creation failed
            MessageBox.Show(String.Format("Create PDF Document Error. {0}", ex.Message));
            return;
        }
        finally
        {
            // Close the PDF document
            pdfDocument.Close();

            Cursor = Cursors.Arrow;
        }

        // Open the created PDF document in default PDF viewer
        try
        {
            System.Diagnostics.Process.Start(outPdfFile);
        }
        catch (Exception ex)
        {
            MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message));
        }
    }