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 = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og=";

    // Display the attachments panel when the PDF document is opened in a PDF viewer
    pdfDocument.ViewerPreferences.PageMode = ViewerPageMode.UseAttachments;

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

    Cursor = Cursors.WaitCursor;
    string outPdfFile = @"DemoAppFiles\Output\PDF_Creator\File_Attachments.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));

        float xLocation = 5;
        float yLocation = 5;

        // Add document title
        TextElement titleTextElement = new TextElement(xLocation, yLocation, "Attach Files and Streams to a PDF Document", titleFont);
        AddElementResult addElementResult = pdfPage.AddElement(titleTextElement);

        yLocation = addElementResult.EndPageBounds.Bottom + 15;

        // Create an attachment from a file without icon
        string fileAttachmentPath = @"DemoAppFiles\Input\Attach_Files\Attachment_File.txt";
        pdfDocument.AddFileAttachment(fileAttachmentPath, "Attachment from File");

        // Create an attachment from a stream without icon
        string fileStreamAttachmentPath = @"DemoAppFiles\Input\Attach_Files\Attachment_Stream.txt";
        System.IO.FileStream attachmentStream = new System.IO.FileStream(fileStreamAttachmentPath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
        pdfDocument.AddFileAttachment(attachmentStream, "Attachment_Stream.txt", "Attachment from Stream");

        // Add the text element
        string text = "Click the next icon to open the attachment from a file:";
        float textWidth = subtitleFont.GetTextWidth(text);
        TextElement textElement = new TextElement(xLocation, yLocation, text, subtitleFont);
        addElementResult = pdfPage.AddElement(textElement);

        // Create an attachment from file with paperclip icon in PDF
        string fileAttachmentWithIconPath = @"DemoAppFiles\Input\Attach_Files\Attachment_File_Icon.txt";
        // Create the attachment from file
        RectangleF attachFromFileIconRectangle = new RectangleF(xLocation + textWidth + 3, yLocation, 6, 10);
        FileAttachmentElement attachFromFileElement = new FileAttachmentElement(attachFromFileIconRectangle, fileAttachmentWithIconPath);
        attachFromFileElement.IconType = FileAttachmentIcon.Paperclip;
        attachFromFileElement.Text = "Attachment from File with Paperclip Icon";
        attachFromFileElement.IconColor = Color.Blue;
        pdfPage.AddElement(attachFromFileElement);

        yLocation = addElementResult.EndPageBounds.Bottom + 10;

        // Add the text element
        text = "Click the next icon to open the attachment from a stream:";
        textWidth = subtitleFont.GetTextWidth(text);
        textElement = new TextElement(xLocation, yLocation, text, subtitleFont);
        addElementResult = pdfPage.AddElement(textElement);

        // Create an attachment from stream with pushpin icon in PDF
        string fileStreamAttachmentWithIconPath = @"DemoAppFiles\Input\Attach_Files\Attachment_Stream_Icon.txt";
        System.IO.FileStream attachmentStreamWithIcon = new System.IO.FileStream(fileStreamAttachmentWithIconPath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
        // Create the attachment from stream
        RectangleF attachFromStreamIconRectangle = new RectangleF(xLocation + textWidth + 3, yLocation, 6, 10);
        FileAttachmentElement attachFromStreamElement = new FileAttachmentElement(attachFromStreamIconRectangle, attachmentStreamWithIcon, "Attachment_Stream_Icon.txt");
        attachFromStreamElement.IconType = FileAttachmentIcon.PushPin;
        attachFromStreamElement.Text = "Attachment from Stream with Pushpin Icon";
        attachFromStreamElement.IconColor = Color.Green;
        pdfPage.AddElement(attachFromStreamElement);

        // 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));
    }
}