Jquery 删除文件后页面数据没更新

代码:
     <script type="text/javascript">
         $(function () {
             $("#divSCA a").click(function () {
                 var name = $(this).prev("a").children('img').attr("alt");
                 $.ajax({
                     url: "delimg.aspx",
                     data: "picname=" + name,
                     datatype: "json",
                     type: "GET",
                     contentType: "application/json; charset=utf-8",
                     success: function (data, textStatus) {
                         alert(data.result);
                     },
                     error: function (XMLHttpRequest, textStatus, errorThrown) {
                         alert(XMLHttpRequest);
                     }
                 });
             });
         });
    </script><div id="divSCA">
      &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href="KunLunUpFile.html">上传图片</a> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type="button" value="关闭" onclick="closeDiv()" />
        <asp:DataList ID="DataList1" runat="server" RepeatColumns="4" 
          DataKeyField="Name">
        <ItemTemplate>
         <a href="#" onclick="SetTextChanged('<%#Eval("Name")%>')">
         <img alt="<%#Eval("Name")%>" height="70" width="70" src='<%#"../../UFile/" +Eval("Name")%>' />
          <br/><%#Eval("Name")%>
          </a>
          <a>删除</a>
        </ItemTemplate>
        </asp:DataList>
       
</div>后台代码：
 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DirectoryInfo imagesfile = new DirectoryInfo(Server.MapPath("../../UFile/"));
        DataList1.DataSource = imagesfile.GetFiles("*.*");//所有文件
        DataList1.DataBind();        }
    }
\\\\\\\\delimg.aspx 代码
 protected void Page_Load(object sender, EventArgs e)
    {
       
            if (Request["picname"] != null)
            {
                Response.Clear();
                Response.ContentType = "application/json";
                String result = "success";
                try
                {
                    File.Delete(Server.MapPath(@"../../UFile/") + Request["picname"].ToString());
                }
                catch (Exception ee)
                {
                    result = ee.Message;
                }
                Response.Write("{\"result\":\"" + result + "\"}");
                Response.End();
            }
        
    }文件删除了，可是 页面上没有及时更新而且弹出的结果是：undefined请问这是怎么回事呢？