Private Sub convertToPdfButton_Click(sender As Object, e As EventArgs) Handles convertToPdfButton.Click ' Create the PDF document where to add the HTML documents Dim pdfDocument As Document = 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 Dim firstPdfPage As PdfPage = pdfDocument.AddPage() ' Enable the creation of a table of contents from H1 to H6 tags found in HTML pdfDocument.TableOfContents.AutoTocItemsEnabled = autoTableOfContentsCheckBox.Checked ' Optionally set the table of contents title pdfDocument.TableOfContents.Title = "Table of Contents" ' Optionally set the title style using CSS sttributes pdfDocument.TableOfContents.TitleStyle = "color:navy; font-family:'Times New Roman'; font-size:28px; font-weight:normal" ' Optionally set the style of level 1 items in table of contents Dim level1TextStyle As String = "color:black; font-family:'Times New Roman'; font-size:20px; font-weight:normal; font-style:normal; background-color:#F0F0F0" pdfDocument.TableOfContents.SetItemStyle(1, level1TextStyle) ' Optionally set the page numbers style of level 1 items in table of contents Dim level1PageNumberStyle As String = "color:black; padding-right:3px; background-color:#F0F0F0; font-size:14px; font-weight:bold" pdfDocument.TableOfContents.SetPageNumberStyle(1, level1PageNumberStyle) Cursor = Cursors.WaitCursor Dim outPdfFile As String = "DemoAppFiles\Output\HTML_to_PDF\Merge_Table_of_Contents.pdf" Try ' Create the first HTML to PDF element Dim firstHtml As HtmlToPdfElement = New HtmlToPdfElement(0, 0, firstUrlTextBox.Text) ' Optionally set a delay before conversion to allow asynchonous scripts to finish firstHtml.ConversionDelay = 2 ' Enable or disable the table of contents for the first HTML document firstHtml.TableOfContentsEnabled = includeFirstHtmlTocCheckBox.Checked ' Add the first HTML to PDF document Dim firstAddResult As AddElementResult = firstPdfPage.AddElement(firstHtml) Dim secondPdfPage As PdfPage = Nothing Dim secondHtmlLocation As PointF = Point.Empty If (startNewPageCheckBox.Checked) Then ' 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) End If ' Create the second HTML to PDF element Dim secondHtml As HtmlToPdfElement = New HtmlToPdfElement(secondHtmlLocation.X, secondHtmlLocation.Y, secondUrlTextBox.Text) ' Optionally set a delay before conversion to allow asynchonous scripts to finish secondHtml.ConversionDelay = 2 ' Enable or disable the table of contents for the second HTML document secondHtml.TableOfContentsEnabled = includeSecondHtmlTocCheckBox.Checked ' Add the second HTML to PDF document secondPdfPage.AddElement(secondHtml) ' Save the PDF document in a memory buffer Dim outPdfBuffer As Byte() = pdfDocument.Save() ' 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 ' Close the PDF document pdfDocument.Close() Cursor = Cursors.Arrow End Try ' Open the created PDF document in default PDF viewer Try System.Diagnostics.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