<asp:UpdatePanel ID="UpdatePanel1"  runat="server">
    <ContentTemplate>
        <asp:Panel ID="Panel1" runat="server">
            11111111111
        </asp:Panel>
        <asp:Panel ID="Panel2" Visible="false" runat="server">
            <asp:TextBox MaxLength="50" ID="TextBox1" runat="server"></asp:TextBox>
            <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="不能为空"
                        ControlToValidate="Deptname" Display="Dynamic"></asp:RequiredFieldValidator>
            <asp:Button ID="Button1" runat="server" OnClick="CancelBtn_Click" Text="取消" />
        </asp:Panel>
    </ContentTemplate>
</asp:UpdatePanel>