Chekbox not enabling
<p>I have a code to generate PDF using Itextsharp Dll
after generating PDF I have checkbox that I want to enable</p>

<p>But I m not able to anable the chekbox
if I remove the code of generating PDf then chekbox gets enabled</p>

<p>How to recover this problem?</p>

<p>I m using folowing code</p>

<pre><code>        Dim filename As String = String.Concat(Guid.NewGuid().ToString(), ".pdf")
        Dim pdfReader As New PdfReader(Server.MapPath("~/Templates/fw8.pdf"))

        Using stream As New MemoryStream()
            Dim pdfStamper As New PdfStamper(pdfReader, stream)

            Dim formFields As AcroFields = pdfStamper.AcroFields
            formFields.SetField("f1-1", FullName)
            formFields.SetField("c1-1", "Yes")
            formFields.SetField("f1-5", Country)
            formFields.SetField("f1-3", Street)
            formFields.SetField("f1-4", City)
            formFields.SetField("f1-9", TaxID)
            pdfStamper.FormFlattening = True
            pdfStamper.Writer.CloseStream = False
            pdfStamper.Close()
            Response.ContentType = "application/pdf"
            Response.AddHeader("Content-disposition", String.Format("attachment; filename={0};", filename))
            stream.WriteTo(Response.OutputStream)
            chk.Enabled=True
</code></pre>
