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？

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