demo_panel 在线工具
<html> <body> <form runat="server"> <asp:Panel id="panel1" runat="server" BackColor="#ff0000" Height="100px" Width="100px"> Hello World! </asp:Panel> <asp:CheckBox id="check1" Text="Hide Panel control" runat="server"/> <asp:Button Text="Reload" runat="server" /> </form> </body> </html>