asp.net – JSON在IE7中未定义

它在chrome，firefox和IE8中工作正常。但IE7出现错误。这是我的jquery onchange事件。

$('SELEct#NationId').change(function () {
        var nationId = $(this).val();
        $.ajax({
            url: 'LoadAreas',type: 'POST',data: JSON.Stringify({ nationId: nationId }),dataType: 'json',contentType: 'application/json',success: function (data) {
                $('SELEct#AreaId').get(0).options.length = 0;
                $('SELEct#AreaId').append('<option value="0">SELEct All</option>');
                $.each(data,function (val,Areas) {
                    $('SELEct#AreaId').append('<option value="' + Areas.Id + '">' + Areas.Name + '</option>');
                });
            }
        });
    });

控制器

[httpPost]
    public ActionResult LoadAreas(int nationId)
    {
        var _Areas = (from c in SessionHandler.CurrentContext.ChAnnelGroups
                      join cgt in SessionHandler.CurrentContext.ChAnnelGroupTypes on c.ChAnnelGroupTypEID equals cgt.ChAnnelGroupTypEID
                      where cgt.Name == "Area" && c.ParentChAnnelGroupId == nationId
                      SELEct new AreaName() { Id = c.ChAnnelGroupId,Name = c.Name }).orderBy(m => m.Name);

        if (_Areas == null)
            return Json(null);
        List<AreaName> managers = (List<AreaName>)_Areas.ToList();

        return Json(managers);
    }