private void convertToPdfButton_Click(object sender, EventArgs e) { // Create the PDF document where to add the HTML documents Document pdfDocument = new Document(); // 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 = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og="; // Create a PDF page where to add the first HTML PdfPage firstPdfPage = pdfDocument.AddPage(); Cursor = Cursors.WaitCursor; string outPdfFile = @"DemoAppFiles\Output\HTML_to_PDF\Merge_Multipe_HTML.pdf"; try { // 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; // Add the first HTML to PDF document AddElementResult firstAddResult = firstPdfPage.AddElement(firstHtml); PdfPage secondPdfPage = null; PointF secondHtmlLocation = Point.Empty; if (startNewPageCheckBox.Checked) { // Create a PDF page where to add the second HTML secondPdfPage = pdfDocument.AddPage(); secondHtmlLocation = PointF.Empty; } else { // Add the second HTML on the PDF page where the first HTML ended secondPdfPage = firstAddResult.EndPdfPage; secondHtmlLocation = new PointF(firstAddResult.EndPageBounds.Left, firstAddResult.EndPageBounds.Bottom); } // Create the second HTML to PDF element HtmlToPdfElement secondHtml = new HtmlToPdfElement(secondHtmlLocation.X, secondHtmlLocation.Y, secondUrlTextBox.Text); // Optionally set a delay before conversion to allow asynchonous scripts to finish secondHtml.ConversionDelay = 2; // Add the second HTML to PDF document secondPdfPage.AddElement(secondHtml); // Save the PDF document in a memory buffer byte[] outPdfBuffer = pdfDocument.Save(); // 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 { // Close the PDF document pdfDocument.Close(); 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)); } }