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="

    ' Add custom HTTP headers

    If header1NameTextBox.Text.Length > 0 AndAlso header1ValueTextBox.Text.Length > 0 Then
        htmlToPdfConverter.HttpRequestHeaders.Add(header1NameTextBox.Text, header1ValueTextBox.Text)
    End If

    If header2NameTextBox.Text.Length > 0 AndAlso header2ValueTextBox.Text.Length > 0 Then
        htmlToPdfConverter.HttpRequestHeaders.Add(header2NameTextBox.Text, header2ValueTextBox.Text)
    End If

    If header3NameTextBox.Text.Length > 0 AndAlso header3ValueTextBox.Text.Length > 0 Then
        htmlToPdfConverter.HttpRequestHeaders.Add(header3NameTextBox.Text, header3ValueTextBox.Text)
    End If

    If header4NameTextBox.Text.Length > 0 AndAlso header4ValueTextBox.Text.Length > 0 Then
        htmlToPdfConverter.HttpRequestHeaders.Add(header4NameTextBox.Text, header4ValueTextBox.Text)
    End If

    If header5NameTextBox.Text.Length > 0 AndAlso header5ValueTextBox.Text.Length > 0 Then
        htmlToPdfConverter.HttpRequestHeaders.Add(header5NameTextBox.Text, header5ValueTextBox.Text)
    End If

    Cursor = Cursors.WaitCursor

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