    protected 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();

        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, "Add Text Notes to a PDF Document", titleFont);
            AddElementResult addElementResult = pdfPage.AddElement(titleTextElement);

            yLocation = addElementResult.EndPageBounds.Bottom + 15;

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

            RectangleF textNoteRectangle = new RectangleF(xLocation + textWidth + 1, yLocation, 10, 10);

            // Create the text note
            TextNoteElement textNoteElement = new TextNoteElement(textNoteRectangle, "This is an initially closed text note");
            textNoteElement.NoteIcon = TextNoteIcon.Note;
            textNoteElement.Open = false;
            pdfPage.AddElement(textNoteElement);

            yLocation = addElementResult.EndPageBounds.Bottom + 10;

            // Add the text element
            text = "This is an already opened text note:";
            textWidth = subtitleFont.GetTextWidth(text);
            textElement = new TextElement(xLocation, yLocation, text, subtitleFont);
            addElementResult = pdfPage.AddElement(textElement);

            textNoteRectangle = new RectangleF(xLocation + textWidth + 1, yLocation, 10, 10);

            // Create the text note
            TextNoteElement textNoteOpenedElement = new TextNoteElement(textNoteRectangle, "This is an initially opened text note");
            textNoteOpenedElement.NoteIcon = TextNoteIcon.Note;
            textNoteOpenedElement.Open = true;
            pdfPage.AddElement(textNoteOpenedElement);

            yLocation = addElementResult.EndPageBounds.Bottom + 10;

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

            textNoteRectangle = new RectangleF(xLocation + textWidth + 1, yLocation, 10, 10);

            // Create the text note
            TextNoteElement helpNoteElement = new TextNoteElement(textNoteRectangle, "This is an initially closed help note");
            helpNoteElement.NoteIcon = TextNoteIcon.Help;
            helpNoteElement.Open = false;
            pdfPage.AddElement(helpNoteElement);

            yLocation = addElementResult.EndPageBounds.Bottom + 10;

            // Add the text element
            text = "This is an already opened help note:";
            textWidth = subtitleFont.GetTextWidth(text);
            textElement = new TextElement(xLocation, yLocation, text, subtitleFont);
            addElementResult = pdfPage.AddElement(textElement);

            textNoteRectangle = new RectangleF(xLocation + textWidth + 1, yLocation, 10, 10);

            // Create the text note
            TextNoteElement helpNoteOpenedElement = new TextNoteElement(textNoteRectangle, "This is an initially opened help note");
            helpNoteOpenedElement.NoteIcon = TextNoteIcon.Help;
            helpNoteOpenedElement.Open = true;
            pdfPage.AddElement(helpNoteOpenedElement);

            yLocation = addElementResult.EndPageBounds.Bottom + 10;

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

            textNoteRectangle = new RectangleF(xLocation + textWidth + 1, yLocation, 10, 10);

            // Create the text note
            TextNoteElement commentNoteElement = new TextNoteElement(textNoteRectangle, "This is an initially closed comment note");
            commentNoteElement.NoteIcon = TextNoteIcon.Comment;
            commentNoteElement.Open = false;
            pdfPage.AddElement(commentNoteElement);

            yLocation = addElementResult.EndPageBounds.Bottom + 10;

            // Add the text element
            text = "This is an already opened comment:";
            textWidth = subtitleFont.GetTextWidth(text);
            textElement = new TextElement(xLocation, yLocation, text, subtitleFont);
            addElementResult = pdfPage.AddElement(textElement);

            textNoteRectangle = new RectangleF(xLocation + textWidth + 1, yLocation, 10, 10);

            // Create the text note
            TextNoteElement commentNoteOpenedElement = new TextNoteElement(textNoteRectangle, "This is an initially opened comment note");
            commentNoteOpenedElement.NoteIcon = TextNoteIcon.Comment;
            commentNoteOpenedElement.Open = true;
            pdfPage.AddElement(commentNoteOpenedElement);

            yLocation = addElementResult.EndPageBounds.Bottom + 10;

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

            textNoteRectangle = new RectangleF(xLocation + textWidth + 1, yLocation, 10, 10);

            // Create the text note
            TextNoteElement paragraphNoteElement = new TextNoteElement(textNoteRectangle, "This is an initially closed paragraph note");
            paragraphNoteElement.NoteIcon = TextNoteIcon.Paragraph;
            paragraphNoteElement.Open = false;
            pdfPage.AddElement(paragraphNoteElement);

            yLocation = addElementResult.EndPageBounds.Bottom + 10;

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

            textNoteRectangle = new RectangleF(xLocation + textWidth + 1, yLocation, 10, 10);

            // Create the text note
            TextNoteElement newParagraphNoteElement = new TextNoteElement(textNoteRectangle, "This is an initially closed new paragraph note");
            newParagraphNoteElement.NoteIcon = TextNoteIcon.NewParagraph;
            newParagraphNoteElement.Open = false;
            pdfPage.AddElement(newParagraphNoteElement);

            yLocation = addElementResult.EndPageBounds.Bottom + 10;

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

            textNoteRectangle = new RectangleF(xLocation + textWidth + 1, yLocation, 10, 10);

            // Create the text note
            TextNoteElement keyNoteElement = new TextNoteElement(textNoteRectangle, "This is an initially closed key note");
            keyNoteElement.NoteIcon = TextNoteIcon.Key;
            keyNoteElement.Open = false;
            pdfPage.AddElement(keyNoteElement);

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

            // Send the PDF as response to browser

            // Set response content type
            Response.AddHeader("Content-Type", "application/pdf");

            // Instruct the browser to open the PDF file as an attachment or inline
            Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Text_Notes.pdf; size={0}", outPdfBuffer.Length.ToString()));

            // Write the PDF document buffer to HTTP response
            Response.BinaryWrite(outPdfBuffer);

            // End the HTTP response and stop the current page processing
            Response.End();
        }
        finally
        {
            // Close the PDF document
            pdfDocument.Close();
        }
    }