使用stringBulder将页码添加到pdf iTexsharp？

Question

我希望在生成pdf文档之前在stringbuilder中逐页添加动态数字页面，通过stringBuilder和executereader生成itextsharp。

数据是从sql查询生成的。

这是无效的，pdf中的所有文档都是在这里生成的：

   protected void GeneraReporte_Click(object sender, EventArgs e) 
{
    using (SqlConnection cone = conexion.conectar())
    {
        using (SqlCommand comand = new SqlCommand("REPORTEALTASBAJAS", cone))
        {
            comand.CommandType = CommandType.StoredProcedure;
            comand.Parameters.Add("@VALOR", SqlDbType.Int).Value = altas;[...]
            cone.Open();
            using (SqlDataReader dr = comand.ExecuteReader())
            {
                if (dr.HasRows)
                {
                    DataTable dt = new DataTable();
                    dt.Columns.AddRange(new DataColumn[13] {
                        new DataColumn("USUARIO"),[...]
                        });
                    dt.Load(dr); //load grid with sql 
                    using (StringWriter sw = new StringWriter())
                    {
                        using (HtmlTextWriter hw = new HtmlTextWriter(sw))
                        {
                            StringBuilder sb = new StringBuilder();
                            sb.Append("<br/>");
                            //HEADER
                            sb.Append("<table style='font-size: 8px;' align='center' width='95%' cellspacing='0' cellpadding='2'>");
                            sb.Append("<tr>");
                            sb.Append("<td align='left'>");
                            sb.Append(@"<img height='50x' src=" + UAT + " />");
                            sb.Append("</td>");
                            sb.Append("<td align='center' colspan = '1'>");
                            sb.Append(@"<img height='50x' align='center' src=" + logoCentro + " />");
                            sb.Append("</td>");
                            sb.Append("<td colspan='1' align='right'>");
                            sb.Append(@"<img height='50x' align='right' src=" + FCAV + " />");
                            sb.Append("<br/></td></tr>");
                            sb.Append("<tr ><td><br/></td><td><br/></td><td><br/></td></tr>");
                            sb.Append("<tr><td align='left'><b></b></td><td align='center'>
                            sb.Append("REPORTE DE ALTAS Y BAJAS");                                
                            sb.Append("</b></td><td align='right'><b></b></td></tr>");
                            sb.Append("<tr ><td><br/></td><td><br/></td><td><br/></td></tr>");
                            if (dr.Read())
                            {
                                if (ddldepto.SelectedItem.Text == "--Todos--")
                                {
                                }
                                else
                                {
                                    sb.Append("<tr><td align='left''><b>SRIA./COORD: " + dr["NOMBREC"].ToString() + "</b></td>");
                                    if (dr["NOMBRED"] == DBNull.Value)
                                    {
                                        sb.Append("<td align='center'><b></b></td>");
                                    }
                                    else
                                    {
                                        sb.Append("<td align='center'><b>DEPARTAMENTO: " + dr["NOMBRED"].ToString()+ "</b></td>");
                                    }
                                    sb.Append("<td align='right'><b>RESPONSABLE: " + dr["NOMBREP"].ToString() + "</b></td></tr>");
                                }
                            }
                            sb.Append("</table>");
                            sb.Append("<br/>");
                            //ITERATE 
                            sb.Append("<table align='center' width='95%' style='' border='1'>");
                            sb.Append("<tr>");
                            foreach (DataColumn column in dt.Columns)
                            {
                                sb.Append("<th style='font-size:9px;text-align: center;color:#000'>");
                                sb.Append("<b>");
                                sb.Append(column.ColumnName);
                                sb.Append("</b>");
                                sb.Append("</th>");
                            }

                            sb.Append("</tr>");
                            foreach (DataRow row in dt.Rows)
                            {
                                sb.Append("<tr style='font-size: 8px;'>");
                                foreach (DataColumn column in dt.Columns)
                                {
                                    sb.Append("<td width='100%'>");
                                    sb.Append(row[column]);
                                    sb.Append("</td>");
                                }
                                sb.Append("</tr>");
                            }
                            sb.Append("</table>");
                            sb.Append("<br/>");
                            //FOOTER
                            sb.Append("<br/>");
                            sb.Append("<table align='center' width='95%'>");
                            sb.Append("<tr><td align='left'>SECRETARIA ADMINISTRATIVA:_________________________________</td><td align='left'>CONTRALORIA INTERNA:______________________________</td></tr>");

                            sb.Append("</table>");

                            //EXPORTA EL STRING COMO PDF
                            StringReader sr = new StringReader(sb.ToString());
                            Document pdfDoc = new Document(PageSize.LEGAL.Rotate(), 10f, 10f, 10f, 0f);
                            HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
                            PdfWriter writer = PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
                            pdfDoc.Open();
                            htmlparser.Parse(sr);
                            pdfDoc.Close();
                            Response.ContentType = "application/pdf";
                            Response.AddHeader("content-disposition", "attachment;filename=Reporte.pdf");
                            Response.Cache.SetCacheability(HttpCacheability.NoCache);
                            Response.Write(pdfDoc);
                            Response.End();
                        }
                    }
                }
                else
                {
                    notif.Visible = true;
                }
            }
        }
    }
}