In the. NET background, you can set controls to display and hide.

For example:

The following shows only the content of the D1 layer. The content of the D2 layer is hidden.

<Div id = "d1" runat = "server"> d1 content </div>

<Div id = "D2" runat = "server" style = "display: none;"> D2 content </div>

If you need to change the front-end display slightly during operations in the background, it can also be implemented. You do not need to debug JS on the front-end (of course, JS can be fully implemented)

 

Add a server button to the page and in the event of the button:

D2.style. Add ("display", "Block ");
D1.style. Add ("display", "NONE ");

 

Check whether the front-end page is displayed. Tips !!!