>Hi everybody,
>
>I've installed VS2008 and I was just playing with my page. I then added UpdatePanel and UpdateProgress and all of the sudden somehow I got 78 or more build errors.
>
>Ok, I panicked, took the previous copy of ASPX, found a problem (bug or feature - if the region is collapsed it is not used in Search/Replace dialog), etc.
>
>Anyway, now there is one strange error pointing to the line 1 of APSX.
>
>Error 16 'System.Web.UI.Control' does not contain a definition for 'DataItem' and no extension method 'DataItem' accepting a first argument of type 'System.Web.UI.Control' could be found (are you missing a using directive or an assembly reference?) C:\Development\Visual Studio Projects\WebSites\FCAdmin\Coordinator\People\Registration.aspx 1 1 C:\...\FCAdmin\
>
>Few minutes ago I was running the page just fine...
>
>I then was just re-arranging some code in the cs file to put all related code together.
>
>What can I do with this error?
>
>Thanks a lot in advance.

Ctrl-Z <g>

Also make sure you have System.Web.dll in your project references, since that is what the error is indicating you are missing.

Edit: shouldn't it be System.Web.UI.WebControls.DataItem instead of System.Web.UI.Control.DataItem?