Error The document has no pages.

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C#3.5

using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter hw = new HtmlTextWriter(sw))
{
GridView1.AllowPaging = false;

this.DataBind();
GridView1.RenderControl(hw);

StringReader sr = new StringReader(sw.ToString());
Document pdfdoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
HTMLWorker htmlparser = new HTMLWorker(pdfdoc);
pdfdoc.PageCount = 1;
PdfWriter.GetInstance(pdfdoc, Response.OutputStream);

pdfdoc.Open();
htmlparser.Parse(sr);
pdfdoc.Close();

Response.ContentType = "Application/pdf";
Response.AddHeader("content-disposition", "attachemnt;filename=FileName.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);

Response.Write(pdfdoc);

Response.End();

}
}