private void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a HTML to PDF converter object with default settings
    HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

    // Set license key received after purchase to use the converter in licensed mode
    // Leave it not set to use the converter in demo mode
    htmlToPdfConverter.LicenseKey = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og=";

    // Set the JPEG Compression Level
    // A higher compression level produces smaller PDF documents but lower quality images in PDF
    // Leave it not set for a default compression level
    htmlToPdfConverter.PdfDocumentOptions.JpegCompressionLevel = int.Parse(jpegCompressionLevelTextBox.Text);

    // Set images scaling before rendering to PDF
    // This option enables the converter to scale the images used in HTML down to their display size in HTML before rendering them in PDF. 
    // This can lead to smaller memory consumption during conversion and to a smaller PDF document size but the images quality in PDF can be lower
    htmlToPdfConverter.PdfDocumentOptions.ImagesScalingEnabled = imagesScalingCheckBox.Checked;

    Cursor = Cursors.WaitCursor;

    // Convert HTML to PDF using the settings above
    string outPdfFile = @"DemoAppFiles\Output\HTML_to_PDF\Images_Scaling_and_JPEG_Compression.pdf";
    try
    {
        // Convert the HTML page to a PDF document in a memory buffer
        byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(urlTextBox.Text);

        // Write the memory buffer in a PDF file
        System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer);
    }
    catch (Exception ex)
    {
        // The HTML to PDF conversion failed
        MessageBox.Show(String.Format("HTML to PDF Error. {0}", ex.Message));
        return;
    }
    finally
    {
        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));
    }
}