Create Blank page in PDF using Itextsharp library

Hello Everyone,
I'm facing problem while generating PDF. The below code is used for every page, but for some pages its generates PDF with data & some page generates PDF with No Data(blank).
Please help me out. Thanks in advance...!!

Namespace
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html;
using iTextSharp.text.html.simpleparser;

Here is my code:-
            if (GridViewAnalysisCategoryMaster.Rows.Count == AppConstants.EMPTY_STRING_LEN)
            {
                ChangeLabelColor(lblerror, "No Records Found to Export", AppConstants.BOOL_TRUE);
                return;
            }
            else
            {
                Response.ContentType = "application/pdf";
                Response.AddHeader("content-disposition", "attachment;filename=AnalysisCategoryMaster_" + DateTime.Now.ToString("dd/MM/yyyy") + ".pdf");
                Response.Cache.SetCacheability(HttpCacheability.NoCache);
                StringWriter sw = new StringWriter();
                HtmlTextWriter hw = new HtmlTextWriter(sw);
                BindData();  // Here i'm binding gridview data to generate PDF.
                GridViewAnalysisCategoryMaster.AllowPaging = AppConstants.BOOL_FALSE;
                GridViewAnalysisCategoryMaster.DataBind();
                GridViewAnalysisCategoryMaster.RenderControl(hw);
                StringReader sr = new StringReader(sw.ToString());
                Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
                HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
                PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
                pdfDoc.Open();
                htmlparser.Parse(sr);
                pdfDoc.Close();
                Response.Write(pdfDoc);
                Response.End();
            }

Regards,
Sumit