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=" ' Enable the creation of a table of contents from H1 to H6 tags found in HTML htmlToPdfConverter.TableOfContentsOptions.AutoTocItemsEnabled = autoTableOfContentsCheckBox.Checked ' Optionally set the table of contents title htmlToPdfConverter.TableOfContentsOptions.Title = "Table of Contents" ' Optionally set the title style using CSS sttributes htmlToPdfConverter.TableOfContentsOptions.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" htmlToPdfConverter.TableOfContentsOptions.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" htmlToPdfConverter.TableOfContentsOptions.SetPageNumberStyle(1, level1PageNumberStyle) Cursor = Cursors.WaitCursor ' Convert HTML to PDF using the settings above Dim outPdfFile As String = "DemoAppFiles\Output\HTML_to_PDF\Auto_Create_Table_of_Contents.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