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="

    ' 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

    Dim param1Name As String = If(param1NameTextBox.Text.Length > 0, param1NameTextBox.Text, "param1")
    Dim param1Value As String = If(param1ValueTextBox.Text.Length > 0, param1ValueTextBox.Text, "Value 1")

    Dim param2Name As String = If(param2NameTextBox.Text.Length > 0, param2NameTextBox.Text, "param2")
    Dim param2Value As String = If(param2ValueTextBox.Text.Length > 0, param2ValueTextBox.Text, "Value 2")

    Dim param3Name As String = If(param3NameTextBox.Text.Length > 0, param3NameTextBox.Text, "param3")
    Dim param3Value As String = If(param3ValueTextBox.Text.Length > 0, param3ValueTextBox.Text, "Value 3")

    Dim param4Name As String = If(param4NameTextBox.Text.Length > 0, param4NameTextBox.Text, "param4")
    Dim param4Value As String = If(param4ValueTextBox.Text.Length > 0, param4ValueTextBox.Text, "Value 4")

    Dim param5Name As String = If(param5NameTextBox.Text.Length > 0, param5NameTextBox.Text, "param5")
    Dim param5Value As String = If(param5ValueTextBox.Text.Length > 0, param5ValueTextBox.Text, "Value 5")

    Dim urlToConvert As String = urlTextBox.Text

    If postMethodRadioButton.Checked Then
        htmlToPdfConverter.HttpPostFields.Add(param1Name, param1Value)
        htmlToPdfConverter.HttpPostFields.Add(param2Name, param2Value)
        htmlToPdfConverter.HttpPostFields.Add(param3Name, param3Value)
        htmlToPdfConverter.HttpPostFields.Add(param4Name, param4Value)
        htmlToPdfConverter.HttpPostFields.Add(param5Name, param5Value)
    Else
        Dim getMethodUri As New Uri(urlTextBox.Text)

        Dim query As String = If(getMethodUri.Query.Length > 0, "&", "?" & String.Format("{0}={1}", param1Name, param1Value))
        query &= String.Format("&{0}={1}", param2Name, param2Value)
        query &= String.Format("&{0}={1}", param3Name, param3Value)
        query &= String.Format("&{0}={1}", param4Name, param4Value)
        query &= String.Format("&{0}={1}", param5Name, param5Value)

        urlToConvert = urlTextBox.Text & query
    End If

    Cursor = Cursors.WaitCursor

    ' Convert HTML to PDF using the settings above
    Dim outPdfFile As String = "DemoAppFiles\Output\HTML_to_PDF\GET_and_POST.pdf"
    Try
        ' Convert the HTML page to a PDF document in a memory buffer
        Dim outPdfBuffer() As Byte = htmlToPdfConverter.ConvertUrl(urlToConvert)

        ' 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