HELP in DIGITAL SIGNATURE

Here is my VB.NET Code :

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim gbStop As Boolean



        'local variables

        Dim jso As Object

        Dim nCount As Integer



        ' get JavaScript Object

        ' note jso is related to PDDoc of a PDF,

        jso = gPdDoc.GetJSObject



        ' count

        nCount = 0

        gbStop = False



        ' search for the text

        If Not jso Is Nothing Then



            ' info



            gApp = CreateObject("acroexch.app")

            gPdDoc = CreateObject("acroexch.pddoc")



            If gPdDoc.Open("c://NoJavaScrip.pdf") Then

                jso = gPdDoc.GetJSObject()



                jso.SetUserPassword("'13434141022'")

                'jso.ShowMyMessage("SetUserDigitalIDPath") 

                jso.SetUserDigitalIDPath("'c://GuangWenZhao.pfx'")

                jso.app.execMenuItem("ADBESDK:AddSignature")

                jso.AddSignature(jso)

                gApp.Show()

            End If

        End If

    End Sub

It made The PDF File Like This:

But I Hope The PDF File Like This:

What can I do For This Result?

Thank you !

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