public partial class ConvertMultipleURLs : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        ctrlDemoLinksBox.LoadDemo("ConvertMultipleUrls");
    }

    protected void btnConvert_Click(object sender, EventArgs e)
    {
        PdfConverter pdfConverter = new PdfConverter();

        // set the license key - required
        pdfConverter.LicenseKey = "B4mYiJubiJiInIaYiJuZhpmahpGRkZE=";

        // add header and footer
        if (cbAddHeader.Checked)
            AddHeader(pdfConverter);
        if (cbAddFooter.Checked)
            AddFooter(pdfConverter);

        // call the converter and get a Document object from URL
        Document pdfDocument = pdfConverter.GetPdfDocumentObjectFromUrl(textBoxURL1.Text.Trim());

        // get the conversion summary object from the event arguments
        ConversionSummary conversionSummary = pdfConverter.ConversionSummary;

        // the PDF page where the previous conversion ended
        PdfPage lastPage = pdfDocument.Pages[conversionSummary.LastPageIndex];
        // the last rectangle in the last PDF page where the previous conversion ended
        RectangleF lastRectangle = conversionSummary.LastPageRectangle;

        // the result of adding an element to a PDF page
        // ofers the index of the PDF page where the rendering ended 
        // and the bounding rectangle of the rendered content in the last page
        AddElementResult addResult = null;

        // the converter for the second URL
        HtmlToPdfElement htmlToPdfURL2 = null;

        if (cbStartOnNewPage.Checked)
        {
            // render the HTML from the second URL on a new page after the first URL
            PdfPage newPage = pdfDocument.Pages.AddNewPage();
            htmlToPdfURL2 = new HtmlToPdfElement(0, 0, textBoxURL2.Text);
            addResult = newPage.AddElement(htmlToPdfURL2);
        }
        else
        {
            // render the HTML from the second URL immediately after the first URL
            htmlToPdfURL2 = new HtmlToPdfElement(lastRectangle.Left, lastRectangle.Bottom, textBoxURL2.Text);
            addResult = lastPage.AddElement(htmlToPdfURL2);
        }

        // the PDF page where the previous conversion ended
        lastPage = pdfDocument.Pages[addResult.EndPageIndex];

        // add a HTML string after all the rendered content
        HtmlToPdfElement htmlStringToPdf = new HtmlToPdfElement(addResult.EndPageBounds.Left, addResult.EndPageBounds.Bottom,
            "<b><i>The rendered content ends here</i></b>", null);

        lastPage.AddElement(htmlStringToPdf);

        byte[] pdfBytes = null;

        try
        {
            pdfBytes = pdfDocument.Save();
        }
        finally
        {
            // close the Document to realease all the resources
            pdfDocument.Close();
        }

        // send the generated PDF document to client browser

        // get the object representing the HTTP response to browser
        HttpResponse httpResponse = HttpContext.Current.Response;

        // add the Content-Type and Content-Disposition HTTP headers
        httpResponse.AddHeader("Content-Type", "application/pdf");
        httpResponse.AddHeader("Content-Disposition", String.Format("attachment; filename=ConvertMultipleUrls.pdf; size={0}", pdfBytes.Length.ToString()));

        // write the PDF document bytes as attachment to HTTP response 
        httpResponse.BinaryWrite(pdfBytes);

        // Note: it is important to end the response, otherwise the ASP.NET
        // web page will render its content to PDF document stream
        httpResponse.End();
    }

    private void AddHeader(PdfConverter pdfConverter)
    {
        string thisPageURL = HttpContext.Current.Request.Url.AbsoluteUri;
        string headerAndFooterHtmlUrl = thisPageURL.Substring(0, thisPageURL.LastIndexOf('/')) + "/HeaderFooter/HeaderAndFooterHtml.htm";

        //enable header
        pdfConverter.PdfDocumentOptions.ShowHeader = true;
        // set the header height in points
        pdfConverter.PdfHeaderOptions.HeaderHeight = 60;
        // set the header HTML area
        HtmlToPdfElement headerHtml = new HtmlToPdfElement(0, 0, 0, pdfConverter.PdfHeaderOptions.HeaderHeight,
                headerAndFooterHtmlUrl, 1024, 0);
        headerHtml.FitHeight = true;
        pdfConverter.PdfHeaderOptions.AddElement(headerHtml);
    }

    private void AddFooter(PdfConverter pdfConverter)
    {
        string thisPageURL = HttpContext.Current.Request.Url.AbsoluteUri;
        string headerAndFooterHtmlUrl = thisPageURL.Substring(0, thisPageURL.LastIndexOf('/')) + "/HeaderFooter/HeaderAndFooterHtml.htm";

        //enable footer
        pdfConverter.PdfDocumentOptions.ShowFooter = true;
        // set the footer height in points
        pdfConverter.PdfFooterOptions.FooterHeight = 60;
        //write the page number
        TextElement footerText = new TextElement(0, 30, "This is page &p; of &P;  ",
            new System.Drawing.Font(new System.Drawing.FontFamily("Times New Roman"), 10, System.Drawing.GraphicsUnit.Point));
        footerText.EmbedSysFont = true;
        footerText.TextAlign = HorizontalTextAlign.Right;
        pdfConverter.PdfFooterOptions.AddElement(footerText);

        // set the footer HTML area
        HtmlToPdfElement footerHtml = new HtmlToPdfElement(0, 0, 0, pdfConverter.PdfFooterOptions.FooterHeight,
                headerAndFooterHtmlUrl, 1024, 0);
        footerHtml.FitHeight = true;
        pdfConverter.PdfFooterOptions.AddElement(footerHtml);
    }
}