StringBuilder 在后台动态输出 html 代码

        protected string bnaner()
        {
            StringBuilder sb = new StringBuilder();
            bool ifurl = false;
            string tpname = "hoticp.swf";
            string tpname2 = "titlebg.jpg";
            string tplink = "http://www.sohu.com";

                if (ifurl == true)
                {
                    sb.AppendFormat("<object width=\"948\" height=\"80\" codebase=\"http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0\" classid=\"clsid:d27cdb6e-ae6d-11cf-96b8-444553540000\">" +
                              "<param value=\"/tp/{0}\" name=\"movie\"/>" +
                              "<param value=\"high\" name=\"quality\"/>" +
                              "<param value=\"false\" name=\"menu\"/>" +
                              "<param value=\"opaque\" name=\"wmode\"/>" +
                              "<embed width=\"948\" height=\"80\" pluginspage=\"http://www.macromedia.com/go/getflashplayer\" type=\"application/x-shockwave-flash\" quality=\"high\" false=\"\" wmode=\"opaque\" src=\"/tp/{0}\"/>" +
                              "</object>", tpname);
                }
                else
                {
                    sb.AppendFormat("<a href=\"{1}\" target=\"_blank\" onFocus=\"this.blur()\"><img src=\"/tp/{0}\" width=\"948\" height=\"80\"></a>", tpname2, tplink);
                }

            
            return sb.ToString();
        }

        protected string classad(int c1)
        {
            StringBuilder sb = new StringBuilder();
            sb.AppendFormat("<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\">");
            SqlDataReader rs = newdb.CommonExecuteReader("select top " + c1 + " Title,ID,DateAndTime from News  order by ID desc");
            while (rs.Read())
            {
                sb.AppendFormat("<tr><td>{2}</td><td><a href=\"abc.aspx?id={1}\" target=\"_blank\">{0}</a></td></tr>", rs[0], rs[1], Convert.ToDateTime(rs[2]).ToString("M-d"));
            }
            sb.AppendFormat("</table>");
            rs.Close();
            return sb.ToString();
        }

前台调用

    <table border="1" cellpadding="0" cellspacing="0" width="100%" align="center">
        <tr>
            <td>
            <%=bnaner()%>
            </td> 
            <td>
            </td>
        </tr>
        <tr>
            <td>
                
                   <%=classad(5) %>
                
            </td> <td>
            </td>
        </tr>                         </table>