Add File Links in a PDF Document

public void CreateFileLinks()
{
    // 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();

    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\Linked_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)
    {
        return;
    }
    finally
    {
        // Close the PDF document
        pdfDocument.Close();
    }
}