求教Jquery的Ajax事件

我选择下拉框列的时候无刷新的绑定GridView。值传过去了,也跳进了相应的方法，值也绑定上去了，可是页面上GridView还是没有值。是没有刷新的原因吗？有人能帮我解决下吗？

脚本代码:

$("#drpRegion").change(function(){                           
                    var id=$("#drpRegion").val();                   
                    if(id!=0)
                    {
                        $("#lbregion").html("");
                        $.ajax({
                            type:"POST",
                            url:"addrecordplan.aspx?regionid="+id,
                            datatype:"html",
                            success:function(data)
                            {
                               
                            }
                        })
                    }
               });

前台代码:

                                           
                                                区域：
                                           
                                           
                                                                                                    onselectedindexchanged="drpRegion_SelectedIndexChanged1">
                                               
                                               
                                           
                                       
                                       
                                           
                                                镜头:
                                           
                                           
                                               
                                                   
                                                       
                                                       
                                                   
                                               
                                                                                      
                                         

后台代码:

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {                                     
                if (Request.QueryString["regionid"] != null)
                {
                    Bind(Request.QueryString["regionid"]);
                }            
            else
            {
                Page.RegisterStartupScript("", "");
            }                  
        }       
    }

///绑定GridView 的方法

 void Bind(string regionid)
    {     
        DeviceSystem devicesys = new DeviceSystem();
        string message;
        List devicelist = devicesys.GetDeviceList(u.sessionid, u.nasid.ToString(), out message);
        List devices = new List();
        foreach (Device item in devicelist)
        {
            if (item.regionid.ToString() == regionid)
            {
                devices.Add(item);
            }
        }
        GridView1.DataSource = devices;
        GridView1.DataBind();       
    }