protected void convertToImageButton_Click(object sender, EventArgs e)
{
    // Create a HTML to Image converter object with default settings
    HtmlToImageConverter htmlToImageConverter = new HtmlToImageConverter();

    // Set license key received after purchase to use the converter in licensed mode
    // Leave it not set to use the converter in demo mode
    htmlToImageConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

    // Set HTML Viewer width in pixels which is the equivalent in converter of the browser window width
    htmlToImageConverter.HtmlViewerWidth = int.Parse(htmlViewerWidthTextBox.Text);

    // Set HTML viewer height in pixels to convert the top part of a HTML page 
    // Leave it not set to convert the entire HTML
    if (htmlViewerHeightTextBox.Text.Length > 0)
        htmlToImageConverter.HtmlViewerHeight = int.Parse(htmlViewerHeightTextBox.Text);

    // Set if the created image has a transparent background
    htmlToImageConverter.TransparentBackground = SelectedImageFormat() == System.Drawing.Imaging.ImageFormat.Png ? transparentBackgroundCheckBox.Checked : false;

    // Set the maximum time in seconds to wait for HTML page to be loaded 
    // Leave it not set for a default 60 seconds maximum wait time
    htmlToImageConverter.NavigationTimeout = int.Parse(navigationTimeoutTextBox.Text);

    // Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed
    // Set this property to 0 if you don't need to wait for such asynchcronous operations to finish
    if (conversionDelayTextBox.Text.Length > 0)
        htmlToImageConverter.ConversionDelay = int.Parse(conversionDelayTextBox.Text);

    System.Drawing.Image[] imageTiles = null;

    if (convertUrlRadioButton.Checked)
    {
        string url = urlTextBox.Text;

        // Convert the HTML page given by an URL to a set of Image objects
        imageTiles = htmlToImageConverter.ConvertUrlToImageTiles(url);
    }
    else
    {
        string htmlString = htmlStringTextBox.Text;
        string baseUrl = baseUrlTextBox.Text;

        // Convert a HTML string with a base URL to a set of Image objects
        imageTiles = htmlToImageConverter.ConvertHtmlToImageTiles(htmlString, baseUrl);
    }

    // Save the first image tile to a memory buffer

    System.Drawing.Image outImage = imageTiles[0];

    // Create a memory stream where to save the image
    System.IO.MemoryStream imageOutputStream = new System.IO.MemoryStream();

    // Save the image to memory stream
    outImage.Save(imageOutputStream, SelectedImageFormat());

    // Write the memory stream to a memory buffer
    imageOutputStream.Position = 0;
    byte[] outImageBuffer = imageOutputStream.ToArray();

    // Close the output memory stream
    imageOutputStream.Close();

    // Send the image as response to browser

    string imageFormatName = imageFormatComboBox.SelectedValue.ToLower();

    // Set response content type
    Response.AddHeader("Content-Type", "image/" + (imageFormatName == "jpg" ? "jpeg" : imageFormatName));

    // Instruct the browser to open the image file as an attachment or inline
    Response.AddHeader("Content-Disposition", String.Format("attachment; filename={0}; size={1}", "HTML_to_Image." + imageFormatName, outImageBuffer.Length.ToString()));

    // Write the image buffer to HTTP response
    Response.BinaryWrite(outImageBuffer);

    // End the HTTP response and stop the current page processing
    Response.End();
}