Export merged ASP.Net GridView cell to PDF using C#

 I've change a bit the code to suit my needs.

protected void imgBtnPrint_Click(object sender, ImageClickEventArgs e)
{           
    Document doc = new Document(PageSize.A4.Rotate(), 30f, 30f, 30f, 30f);
    PdfWriter.GetInstance(doc, Response.OutputStream);
    doc.Open();
 
    for (int i = 0; i < gvSiriAudit.PageCount; i++)
    {
        //Set the Page Index.
        gvSiriAudit.PageIndex = i;
 
        //Hide Page as not needed in PDF.
        gvSiriAudit.PagerSettings.Visible = false;
 
        //Populate the GridView with records for the Page Index.
        this.BindGridSiriAudit();
 
        //Render the GridView as HTML and add to PDF.
        using (StringWriter sw = new StringWriter())
        {
            using (HtmlTextWriter hw = new HtmlTextWriter(sw))
            {
                gvSiriAudit.RenderControl(hw);
                HTMLWorker htmlparser = new HTMLWorker(doc);                       
                StringReader sr = new StringReader(sw.ToString());
                gvSiriAudit.HeaderStyle.ForeColor = System.Drawing.Color.White;
                htmlparser.Parse(sr);
            }
        }
 
        //Add a new Page to PDF document.
        doc.NewPage();
    }
    
    doc.Close();
    Response.ContentType = "Application/pdf";
    Response.AddHeader("Content-Disposition", "inline; filename=GridviewExport.pdf");
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    Response.Write(doc);
    Response.End();
}