绝对整洁 优秀的代码！

<asp:ToolkitScriptManager runat="server" ID="ToolkitScriptManager1"  />

<asp:ModalPopupExtender runat="server" ID="modalpopup" TargetControlID="Show"

PopupControlID="Modal" PopupDragHandleControlID="Head" OkControlID="Ok"  />

<asp:LinkButton runat="server" ID="Show"  Text="Show" />

<asp:Panel      runat="server" ID="Modal" BackColor="White">

<asp:Panel      runat="server" ID="Head"  BackColor="Coral" />

<p>这里是要显示的提示内容,并且这是一个很简单的演示</p>

<asp:LinkButton runat="server" ID="Ok"    Text="OK" />

</asp:Panel>