Merge Multiple HTML Pages into a Single PDF

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 firstPdfPage = pdfDocument.AddPage();

    // Create Header
    if (addHeaderCheckBox.Checked)
        CreateHeader(pdfDocument, drawHeaderLineCheckBox.Checked);

    // Create Footer
    if (addFooterCheckBox.Checked)
        CreateFooter(pdfDocument, drawFooterLineCheckBox.Checked, addPageNumbersInFooterCheckBox.Checked);

    // Add First HTML

    // Create the first HTML to PDF element
    HtmlToPdfElement firstHtml = new HtmlToPdfElement(0, 0, firstUrlTextBox.Text);

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

    // Optionally add a space between header and the content generated by this HTML to PDF element
    // The spacing for first page and the subsequent pages can be set independently
    // Leave this option not set for no spacing
    firstHtml.Y = float.Parse(firstPageSpacingTextBox.Text);
    firstHtml.TopSpacing = float.Parse(headerSpacingTextBox.Text);

    // Optionally add a space between footer and the content generated by this HTML to PDF element
    // Leave this option not set for no spacing
    firstHtml.BottomSpacing = float.Parse(footerSpacingTextBox.Text);

    // Set the header visibility in first, odd and even pages
    if (addHeaderCheckBox.Checked)
    {
        firstPdfPage.ShowHeader = showHeaderInFirstPageCheckBox.Checked;
        firstHtml.ShowHeaderInEvenPages = showHeaderInEvenPagesCheckBox.Checked;
        firstHtml.ShowHeaderInOddPages = showHeaderInOddPagesCheckBox.Checked;
    }

    // Set the footer visibility in first, odd and even pages
    if (addFooterCheckBox.Checked)
    {
        firstPdfPage.ShowFooter = showFooterInFirstPageCheckBox.Checked;
        firstHtml.ShowFooterInEvenPages = showFooterInEvenPagesCheckBox.Checked;
        firstHtml.ShowFooterInOddPages = showFooterInOddPagesCheckBox.Checked;
    }

    // Add the first HTML to PDF element to PDF document
    firstPdfPage.AddElement(firstHtml);

    // Add Second HTML

    // Create the second HTML to PDF element
    HtmlToPdfElement secondHtml = new HtmlToPdfElement(0, 0, secondUrlTextBox.Text);

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

    // Optionally add a space between header and the content generated by this HTML to PDF element
    // Leave this option not set for no spacing
    secondHtml.TopSpacing = float.Parse(headerSpacingTextBox.Text);

    // Optionally add a space between footer and the content generated by this HTML to PDF element
    // Leave this option not set for no spacing
    secondHtml.BottomSpacing = float.Parse(footerSpacingTextBox.Text);

    // Set the header visibility in odd and even pages
    if (addHeaderCheckBox.Checked)
    {
        secondHtml.ShowHeaderInEvenPages = showHeaderInEvenPagesCheckBox.Checked;
        secondHtml.ShowHeaderInOddPages = showHeaderInOddPagesCheckBox.Checked;
    }

    // Set the footer visibility in odd and even pages
    if (addFooterCheckBox.Checked)
    {
        secondHtml.ShowFooterInEvenPages = showFooterInEvenPagesCheckBox.Checked;
        secondHtml.ShowFooterInOddPages = showFooterInOddPagesCheckBox.Checked;
    }

    if (startNewPageCheckBox.Checked)
    {
        // Create a PDF page where to add the second HTML
        PdfPage secondPdfPage = pdfDocument.AddPage();
        // Add the second HTML to PDF element to PDF document at the beginnig of the new PDF page 
        secondPdfPage.AddElement(secondHtml);
    }
    else
    {
        // Add the second HTML to PDF element to PDF document write after the last added element
        pdfDocument.AddElement(secondHtml);
    }

    // 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=Header_Footer_in_Merge_Multipe_HTML.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();
}

/// <summary>
/// Creates the document header
/// </summary>
/// <param name="pdfDocument">The PDF document object</param>
/// <param name="drawHeaderLine">A flag indicating if a line should be drawn at the bottom of the header</param>
private void CreateHeader(Document pdfDocument, bool drawHeaderLine)
{
    string headerHtmlString = System.IO.File.ReadAllText(Server.MapPath("~/DemoAppFiles/Input/HTML_Files/Header_HTML.html"));
    string headerBaseUrl = "http://www.evopdf.com/demo/DemoAppFiles/Input/HTML_Files/";

    // Add a header to document having 60 points in height
    pdfDocument.AddHeaderTemplate(60);

    // Create a HTML element to be added in header
    HtmlToPdfElement headerHtml = new HtmlToPdfElement(headerHtmlString, headerBaseUrl);

    // Set the HTML element to fit the container height
    headerHtml.FitHeight = true;

    // Add HTML element to header
    pdfDocument.Header.AddElement(headerHtml);

    if (drawHeaderLine)
    {
        PdfPage firstPage = pdfDocument.GetPage(0);
        float headerWidth = firstPage.PageSize.Width - firstPage.Margins.Left - firstPage.Margins.Right;
        float headerHeight = pdfDocument.Header.Height;

        // Create a line element for the bottom of the header
        LineElement headerLine = new LineElement(0, headerHeight - 1, headerWidth, headerHeight - 1);

        // Set line color
        headerLine.ForeColor = RgbColor.Gray;

        // Add line element to the bottom of the header
        pdfDocument.Header.AddElement(headerLine);
    }
}

/// <summary>
/// Creates the document footer
/// </summary>
/// <param name="htmlToPdfConverter">The HTML to PDF Converter object</param>
/// <param name="addPageNumbers">A flag indicating if the page numbering is present in footer</param>
/// <param name="drawFooterLine">A flag indicating if a line should be drawn at the top of the footer</param>
private void CreateFooter(Document pdfDocument, bool addPageNumbers, bool drawFooterLine)
{
    string footerHtmlString = System.IO.File.ReadAllText(Server.MapPath("~/DemoAppFiles/Input/HTML_Files/Footer_HTML.html"));
    string footerBaseUrl = "http://www.evopdf.com/demo/DemoAppFiles/Input/HTML_Files/";

    // Add a footer to document having 60 points in height
    pdfDocument.AddFooterTemplate(60);

    // Create a HTML element to be added in footer
    HtmlToPdfElement footerHtml = new HtmlToPdfElement(footerHtmlString, footerBaseUrl);

    // Set the HTML element to fit the container height
    footerHtml.FitHeight = true;

    // Add HTML element to footer
    pdfDocument.Footer.AddElement(footerHtml);

    // Add page numbering
    if (addPageNumbers)
    {
        // Create a text element with page numbering place holders &p; and & P;
        TextElement footerText = new TextElement(0, 30, "Page &p; of &P;  ", new PdfFont("Times New Roman", 10, true));

        // Align the text at the right of the footer
        footerText.TextAlign = HorizontalTextAlign.Right;

        // Set page numbering text color
        footerText.ForeColor = RgbColor.Navy;

        // Embed the text element font in PDF
        footerText.EmbedSysFont = true;

        // Add the text element to footer
        pdfDocument.Footer.AddElement(footerText);
    }

    if (drawFooterLine)
    {
        // Calculate the footer width based on PDF page size and margins
        PdfPage firstPage = pdfDocument.GetPage(0);
        float footerWidth = firstPage.PageSize.Width - firstPage.Margins.Left - firstPage.Margins.Right;

        // Create a line element for the top of the footer
        LineElement footerLine = new LineElement(0, 0, footerWidth, 0);

        // Set line color
        footerLine.ForeColor = RgbColor.Gray;

        // Add line element to the bottom of the footer
        pdfDocument.Footer.AddElement(footerLine);
    }
}