how to download an asp.net table in a pdf format ?

Response.ContentType = "application/pdf";
        Response.AddHeader("content-disposition", "attachment;filename=OutputName.pdf");
        Response.Cache.SetCacheability(HttpCacheability.NoCache);

        StringWriter stringWriter = new StringWriter();
        HtmlTextWriter htmlTextWriter = new HtmlTextWriter(stringWriter);
       
           
            ContentDiv.RenderControl(htmlTextWriter);  // ContentDiv is the container of contents to convert as pdf 

            StringReader stringReader = new StringReader(stringWriter.ToString());
            Document Doc = new Document(PageSize.A4, 10f, 10f, 100f, 0f);
            HTMLWorker htmlparser = new HTMLWorker(Doc);
            PdfWriter.GetInstance(Doc, Response.OutputStream);

            Doc.Open();
            htmlparser.Parse(stringReader);
            Doc.Close();
            Response.Write(Doc);
            Response.End();

public override void VerifyRenderingInServerForm(Control control)
    {
        /* Verifies that the control is rendered */
    }
    protected void btnExport_Click(object sender, EventArgs e)
    {
        
         Response.ContentType = "application/pdf";
        Response.AddHeader("content-disposition", "attachment;filename=testpage.pdf");
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        StringWriter sw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        this.Page.RenderControl(hw);
        StringReader sr = new StringReader(sw.ToString());
        Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 100f, 0f);
        HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
        PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
        pdfDoc.Open();
        htmlparser.Parse(sr);
        pdfDoc.Close();
        Response.Write(pdfDoc);
        Response.End();
    }
  
}