DotNetBrowser 2.4

// Tell the Chromium engine to perform the printing programmatically.
browser.RequestPrintHandler =
    new Handler<RequestPrintParameters, RequestPrintResponse>(p =>
    {
        return RequestPrintResponse.Print();
    });

// This handler is used for printing regular web pages programmatically.
browser.PrintHtmlContentHandler 
    = new Handler<PrintHtmlContentParameters, PrintHtmlContentResponse>(p =>
    {
        string pdfFilePath = Path.GetFullPath("result.pdf");

        // Get the print job for the built-in PDF printer.
        IPrintJob<PdfPrinter.IHtmlSettings> printJob = p.Printers.Pdf.PrintJob;

        // Subscribe to its PrintCompleted event and show a message box when it's done.
        printJob.PrintCompleted += (sender, args) => 
        { 
            BeginInvoke((Action) (() => 
                { MessageBox.Show("Printing completed: \n"+pdfFilePath); }));
        };

        // Apply the necessary print settings
        printJob.Settings.Apply(s =>
        {
            // Enable printing header and footer.
            s.PrintingHeaderFooterEnabled = true;
            // Specify the path to save the result.
            s.PdfFilePath = pdfFilePath;
        });

        // Tell Chromium to use the built-in PDF printer for printing.
        return PrintHtmlContentResponse.Print(p.Printers.Pdf);
    });

// Load the web page and wait until it is loaded completely.
browser.Navigation.LoadUrl("teamdev.com").Wait();
// Initiate printing.
browser.MainFrame.Print();