ASP.NET 2.0 利用 checkbox获得选中行的行号, 在footer中显示

我的思路是添加一个隐藏列，里面放一个textbox控件，用来记录行号，然后在运行的时候取出来显示在footer中。
隐藏列为第一列，checkbox添加到模板列中，利用它的OnCheckedChanged事件执行代码，填充行号到footer
页面代码如下

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" ShowFooter="True" 
        DataSourceID="SqlDataSource1" OnRowDataBound="GridView1_RowDataBound" 
        OnSelectedIndexChanged="GridView1_SelectedIndexChanged" >
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:TextBox ID="rowNumber" runat="server">12</asp:TextBox>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="选择">
                    <ItemTemplate>
                        <asp:CheckBox ID="CheckBox1" runat="server" OnCheckedChanged="CheckBox1_CheckedChanged" AutoPostBack="True" />
                    </ItemTemplate>
                    <FooterTemplate >
                        <asp:Label ID="lblmsg" runat="server">你点击了第</asp:Label>
                    </FooterTemplate>
                    <ControlStyle Width="200px" />
                </asp:TemplateField>
                   
            </Columns>
            
        </asp:GridView>

后台代码如下

 protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
    {
        //Response.Write();
        GridViewRow row = ((CheckBox)sender).Parent.Parent as GridViewRow;
        TextBox tb = (TextBox)(row.FindControl("rowNumber"));
        GridView1.FooterRow.Cells[1].Text = tb.Text;
        //Response.Write(tb.Text);
    }

测试通过，谢谢1！