<link href="http://www.cnblogs.com/Content/themes/base/jquery-ui.css" rel="stylesheet" type="text/css" />
<script src="http://www.cnblogs.com/Scripts/jquery-1.4.4.min.js" type="text/javascript"></script>
<script src="http://www.cnblogs.com/Scripts/jquery-ui.js" type="text/javascript"></script>

    function PoeviewExcel() {
        $.ajax(
        {
            url: "send/index",
            type: "post",
            success: function (data) {
 var divshow = $("#showInfo2");
                divshow.text("");// 清空数据
                divshow.append(data); // 添加Html内容，不能用Text 或 Val
                divshow.dialog({
                    title: "短信群发系统",
                    height: 250,
                    width: 580
                });

            }
        }
        );
        return false;
    }

<a href="#" onclick="return PoeviewExcel()">预览数据</a>
    <div id="divPreview" style="display: none">
        <text id="showInfo2"></text>
    </div>

        public string GetImportReport()
        {
            DataTable dt = this.ImportExcel();
            string content = String.Empty;
            content = @"<table width='550' border='0' cellspacing='0' cellpadding='0' bgcolor='#D2D2D2'>"
                    + " <tr  bgcolor='#336699'>"
                    + "    <td align='center'><strong>序号</strong></td>"
                    + "    <td align='center'><strong>目标手机号</strong></td>"
                    + "    <td align='center'><strong>发送内容</strong></td>"
                    +"</tr>";
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                content += "<tr>"
                 + " <td width='50' align='center'>" + i.ToString()+"</td>"
                 + " <td width='150' align='center'>" + dt.Rows[i][0].ToString() + "</td>"
                 + " <td width='150'  >" + dt.Rows[i][1].ToString() + "</td>"
                 + " </tr>";
            }
            content += "</table>";
            return content;
        }