GridView页面没有实现无刷新更新数据

  <div>

               <asp:ScriptManager ID="ScriptManager1" runat="server">

               </asp:ScriptManager>

               <asp:UpdatePanel ID="UpdatePanel1" runat="server">

                 <ContentTemplate>

              

    <table>

       <tr>

          <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"  DataKeyNames="ID"

               PageSize="15">

               <Columns>

                  <asp:BoundField DataField="id" HeaderText="序列号" />

                  <asp:BoundField DataField="name" HeaderText="姓名" />                 

               </Columns>

          </asp:GridView>        

       </tr>

       <tr>

          <asp:Repeater ID="Repeater1" runat="server"  > //生成自定义格式的数字页码

             <ItemTemplate>

                 <asp:LinkButton runat="server" ID="lnkBtn"  EnableViewState="true"

                  CommandArgument='<%#Eval("page") %>' CommandName="PageNum" OnClick="lnkBtn_Click"><%#Eval("page") %></asp:LinkButton>

             </ItemTemplate>

           </asp:Repeater>

        </tr>

      </table>         

      </ContentTemplate>

</asp:UpdatePanel>

</div>

，执行的时候单击数字页码，页面都刷新一下，什么原因呢
------解决方案--------------------
把UpdatePanel放进gridview  itemTemplate里面试试。然后加trigger 把button的id给它