asp.net导出excel

            string title = "style='color:White;background-color:#2176B9;border:1px solid #D4E2EB;text-align:center;vertical-align:middle;height:50px;'";

            StringBuilder html = new StringBuilder();

            html.Append("<table><tr><td colspan='8' " + headline + ">" + titleText + "</td></tr></table>");

            html.Append("<table cellspacing='1' CellPadding='5' " + table + ">");

            html.Append("<tr>");

            html.Append("<td colspan='8'>");//13

            html.Append("<b>操作员：</b>" + user.Name + "; ");

            html.Append("<b>总面积（平方米）：</b>" + areaTotal + "; ");

            html.Append("<b>总卡数（张）：</b>" + cardTotal + "; ");

            html.Append("<b>导出时间：</b>" + string.Format("{0:yyyy-MM-dd}", DateTime.Now) + "; ");

            html.Append("</td>");

            html.Append("</tr>");

            html.Append("<tr>");

            html.Append("<td colspan='8'>");

            html.Append("<b>筛选条件【</b>");

            html.Append(condition);

            html.Append("<b>】</b>");

            html.Append("</td>");

            html.Append("</tr>");

            html.Append("<tr></tr>");

            html.Append("<tr>");

            html.Append("<td " + title + ">序号</td>");

            html.Append("<td width='100pt' " + title + ">项目名称</td>");

            html.Append("<td " + title + ">建筑面积(平方米)</td>");

            html.Append("<td " + title + ">工程地址</td>");

            html.Append("<td " + title + ">施工单位</td>");

            html.Append("<td " + title + ">监理单位</td>");

            html.Append("<td " + title + ">形象进度</td>");

            ......