Script controls may not be registered before PreRender – Before you go crazy

It’s quite common losing hours and hours on a pretty obvious mistake, plus in this case the internet hasn’t helped me that much.

The problem: I have an asp.net (content) page that’s using a master page. In this content page I have an update panel. Everything is working fine until I add an UpdateProgress. Opening the page i get a friendly Script controls may not be registered before PreRender .

Before trying some voodoo stuff…check the OnPreRender event. Does it call the same event in the base page?

base.OnPreRender(e);

Is it working now?

Keep coding and happy new beer to all of you.

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