Private Sub convertToPdfButton_Click(sender As Object, e As EventArgs) Handles convertToPdfButton.Click
    ' Create a HTML to PDF converter object with default settings
    Dim htmlToPdfConverter As HtmlToPdfConverter = 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="

    ' Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed
    ' Set this property to 0 if you don't need to wait for such asynchcronous operations to finish
    htmlToPdfConverter.ConversionDelay = 2

    ' Set proxy type
    ' when converting HTML pages from HTTP addresses use the Http proxy type
    ' when converting HTML pages from HTTPS addresses use Socks5 proxy type and make sure the proxy server
    ' is also configured to use SOCKS5 protocol
    htmlToPdfConverter.ProxyOptions.Type = SelectedProxyType()

    ' Set proxy hostname and port number
    ' Hostname and port number are required when the proxy type is set to something different from None value
    htmlToPdfConverter.ProxyOptions.HostName = hostNameTextBox.Text
    htmlToPdfConverter.ProxyOptions.PortNumber = Integer.Parse(portNumberTextBox.Text)

    ' Optionally set proxy username and password if they are required by proxy server
    htmlToPdfConverter.ProxyOptions.Username = usernameTextBox.Text
    htmlToPdfConverter.ProxyOptions.Password = passwordTextBox.Text

    ' Optionally set a list of hosts to be accessed directly without a proxy
    If (bypassedHostTextBox.Text.Length > 0) Then
        htmlToPdfConverter.ProxyOptions.BypassedHosts = New String() {bypassedHostTextBox.Text}
    End If

    Cursor = Cursors.WaitCursor

    ' Convert HTML to PDF using the settings above
    Dim outPdfFile As String = "DemoAppFiles\Output\HTML_to_PDF\Proxy_Options.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
        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