The document has no pages error while convert wepage to pdf in itextsharp

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Following is the code for convert webpage to pdf using itextsharp

protected void btnExport_Click(object sender, EventArgs e)
        {
            StringWriter sw = new StringWriter();
            StringReader sr = new StringReader(sw.ToString());
            Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
            PdfWriter writer = PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
            pdfDoc.Open();
            XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, sr);
            pdfDoc.Close();
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "attachment;filename=HTML.pdf");
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            Response.Write(pdfDoc);
            Response.End();

}



This gives me "The document has no pages" in this line

pdfDoc.Close();

How can I resolve this

What I have tried:

I added itextsharp dll file and

using iTextSharp.tool.xml;

both