Protected 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

    ' Convert the HTML page to a PDF document in a memory buffer
    Dim outPdfBuffer As Byte() = htmlToPdfConverter.ConvertUrl(urlTextBox.Text)

    ' Send the PDF as response to browser

    ' Set response content type
    Response.AddHeader("Content-Type", "application/pdf")

    ' Instruct the browser to open the PDF file as an attachment or inline
    Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Proxy_Options.pdf; size={0}", outPdfBuffer.Length.ToString()))

    ' Write the PDF document buffer to HTTP response
    Response.BinaryWrite(outPdfBuffer)

    ' End the HTTP response and stop the current page processing
    Response.End()
End Sub