GridView放在UpdatePanle里面模板列取值！

   今天用了一下UpdatePanle，遇到一个问题，先记录下来。GridView放在UpdatePanle里面模板列取不到值！

 <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <table align=center width=800>
        <tr><td>
            <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" Width="154px" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
               <asp:ListItem Value="0"></asp:ListItem>
                <asp:ListItem Value="1">ID大于15</asp:ListItem>
                <asp:ListItem Value="2">id小于15</asp:ListItem>
            </asp:DropDownList></td>
            <td>id值为<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox></td>
            </tr>
            </table>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
        <table align=center width=800>
        
        <tr><td>
            <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID"
                DataSourceID="SqlDataSource1" Width="800" CssClass="GridViewCss"  OnRowCommand="GridView1_RowCommand">
                <Columns>
                    <asp:BoundField DataField="UserCode" HeaderText="UserCode" SortExpression="UserCode" />
                    <asp:BoundField DataField="UserName" HeaderText="UserName" SortExpression="UserName" />
                    <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True"
                        SortExpression="ID" />
                    <asp:BoundField DataField="Birthday" HeaderText="Birthday" SortExpression="Birthday" />
                    <asp:BoundField DataField="Sex" HeaderText="Sex" SortExpression="Sex" />
                    <asp:BoundField DataField="Email" HeaderText="Email" SortExpression="Email" />
                    <asp:BoundField DataField="Address" HeaderText="Address" SortExpression="Address" />
                    <asp:TemplateField HeaderText="ID" >
                    <ItemTemplate >        
                       
                    <asp:Label ID="lblid" runat=server Text='<%# Eval("ID") %>'></asp:Label></ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="操作">
                              
                                <itemtemplate>
<asp:LinkButton id="lbtndll" runat="server"  CommandName="lbtndll"  CommandArgument ="<%# GridView1.Rows.Count %>">取值</asp:LinkButton> 
</itemtemplate>
                            </asp:TemplateField>
                </Columns>
                <HeaderStyle CssClass="GridViewHeader" />
            </asp:GridView>
            <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:IwoakOAConnectionString %>"
                SelectCommand="SELECT [UserCode], [UserName], [ID], [Birthday], [Sex], [Email], [Address] FROM [Iw_User]">
            </asp:SqlDataSource>
            </td></tr>
        </table>
        </ContentTemplate>
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="DropDownList1" EventName="SelectedIndexChanged" />
          
        </Triggers>
    </asp:UpdatePanel>

后台代码：

 protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    }

将GridView移出UpdatePanle外是完全没有问题的。
原来取不到值是因为我把TextBox放在了Updatepanle外，谢谢老赵提醒！