Set Initial Zoom Level of the Generated PDF Document

protected void convertToPdf()
{
    // 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();

    // Set the PDF Viewer Preferences

    // Set page layout to continuous one column, single page, two column left, two column right
    pdfDocument.ViewerPreferences.PageLayout = SelectedPageLayout();
    // Set page mode to default, display attachments, display thumbnails, display attachments
    pdfDocument.ViewerPreferences.PageMode = SelectedPageMode();

    // Hide the viewer menu
    pdfDocument.ViewerPreferences.HideMenuBar = hideMenuBarCheckBox.Checked;
    // Hide the viewer toolbar
    pdfDocument.ViewerPreferences.HideToolbar = hideToolbarCheckBox.Checked;
    // Hide scroll bars and navigation controls
    pdfDocument.ViewerPreferences.HideWindowUI = hideWindowUICheckBox.Checked;

    // Display the document title in viewer title bar
    pdfDocument.ViewerPreferences.DisplayDocTitle = displayDocTitleCheckBox.Checked;

    // Create a HTML to PDF element to add to document
    HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(urlTextBox.Text);

    // Optionally set a delay before conversion to allow asynchonous scripts to finish
    htmlToPdfElement.ConversionDelay = 2;

    // Add the HTML to PDF element to document
    pdfPage.AddElement(htmlToPdfElement);

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