update panel not allowing

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ASP.NET

In one of the page I have 2 updatepanels with one panel and a repeater in each.

The first panel is displayed during page load itself. In code behind I meet a stage wherein I need to show the 2nd panel in the same position of the first panel.

It works when I dont use updatemode='conditional' but goes to server and returns. Whereas when I use updatemode='conditional' it doesn't go to server but at the same time not allowing the second panel to take over the position.

The panel1='false' is of no use. My requirement is that it should not go to server but at the same time it should allow the second panel for replacement at the same position.

Can anyone give me a solution?