Add Internal Links in a PDF Document

protected void createPdf()
{
    // Get the server IP and port
    String serverIP = textBoxServerIP.Text;
    uint serverPort = uint.Parse(textBoxServerPort.Text);

    // Create a PDF document
    Document pdfDocument = null;
    if (radioButtonUseTcpService.Checked)
        pdfDocument = new Document(serverIP, serverPort);
    else
        pdfDocument = new Document(true, textBoxWebServiceUrl.Text);

    // Set optional service password
    if (textBoxServicePassword.Text.Length > 0)
        pdfDocument.ServicePassword = textBoxServicePassword.Text;

    // 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();

    // Add second page to PDF document
    PdfPage secondPdfPage = pdfDocument.AddPage();

    // Add third page to PDF document
    PdfPage thirdPdfPage = pdfDocument.AddPage();

    // The titles font used to mark various sections of the PDF document
    PdfFont titleFont = new PdfFont("Times New Roman", 10, true);
    titleFont.Bold = true;
    PdfFont subtitleFont = new PdfFont("Times New Roman", 8, true);

    // The links text font
    PdfFont linkTextFont = new PdfFont("Times New Roman", 8, true);
    linkTextFont.Bold = true;
    linkTextFont.Underline = true;

    // Add document title
    TextElement titleTextElement = new TextElement(5, 5, "Create Internal Links in PDF Document", titleFont);
    pdfPage.AddElement(titleTextElement);

    // Add a text in second page
    TextElement secondPageTextElement = new TextElement(5, 5, "This text is the target of an internal text link", subtitleFont);
    secondPdfPage.AddElement(secondPageTextElement);

    // Add a text in third page
    TextElement thirdPageTextElement = new TextElement(5, 5, "This text is the target of an internal image link", subtitleFont);
    thirdPdfPage.AddElement(thirdPageTextElement);

    // Make a text in PDF an internal link to the second page of the PDF document

    // Add the text element
    string text = "Click this text to go to the second page of this document!";
    TextElement linkTextElement = new TextElement(5, 30, 200, text, linkTextFont);
    linkTextElement.ForeColor = RgbColor.Navy;
    pdfPage.AddElement(linkTextElement);

    // Make the text element an internal link to the second page of this document
    RectangleFloat linkRectangle = RectangleFloat.Empty;
    // Create the destination in second page
    ExplicitDestination secondPageDestination = new ExplicitDestination(secondPdfPage, new PointFloat(5, 5));
    // Create the internal link from text element to second page
    InternalLinkElement internalLink = new InternalLinkElement(linkRectangle, secondPageDestination);

    // Add the internal link to PDF document
    pdfDocument.AddElement(internalLink, 0, true, true, 0, true, false);

    // Make an image in PDF an internal link to the third page of the PDF document

    TextElement subtitleTextElement = new TextElement(0, 0, "Click the image below to go to the third page of this document:", subtitleFont);
    pdfDocument.AddElement(subtitleTextElement, 10);

    // Add the image element
    ImageElement linkImageElement = new ImageElement(0, 0, 120, Server.MapPath("~/DemoAppFiles/Input/Images/logo.jpg"));
    pdfDocument.AddElement(linkImageElement);

    // Make the image element an internal link to the third page of this document
    linkRectangle = RectangleFloat.Empty;
    // Create the destination in third page
    ExplicitDestination thirdPageDestination = new ExplicitDestination(thirdPdfPage, new PointFloat(5, 5));
    // Create the internal link from image element to third page
    internalLink = new InternalLinkElement(linkRectangle, thirdPageDestination);

    // Add the internal link to PDF document
    pdfDocument.AddElement(internalLink, 0, true, true, 0, true, false);

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