Private Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles convertToPdfButton.Click ' Create a HTML to PDF converter object with default settings Dim htmlToPdfConverter As 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=" ' Auto Create a hierarchy of bookmarks from H1 to H6 tags found in HTML If autoBookmarksCheckBox.Checked Then ' Enable the creation of a hierarchy of bookmarks from H1 to H6 tags htmlToPdfConverter.PdfBookmarkOptions.AutoBookmarksEnabled = True ' Display the bookmarks panel in PDF viewer when the generated PDF is opened htmlToPdfConverter.PdfViewerPreferences.PageMode = ViewerPageMode.UseOutlines End If Cursor = Cursors.WaitCursor ' Convert HTML to PDF using the settings above Dim outPdfFile As String = "DemoAppFiles\Output\HTML_to_PDF\Auto_Create_Hierarchical_Bookmarks.pdf" Try ' Convert the HTML page to a PDF document in a memory buffer Dim outPdfBuffer() As Byte = htmlToPdfConverter.ConvertUrl(urlTextBox.Text) ' Write the memory buffer in a PDF file System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer) Catch ex As Exception ' The HTML to PDF conversion failed MessageBox.Show(String.Format("HTML to PDF Error. {0}", ex.Message)) Return Finally Cursor = Cursors.Arrow End Try ' Open the created PDF document in default PDF viewer Try Process.Start(outPdfFile) Catch ex As Exception MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message)) End Try End Sub