>>>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.
>
>Similar page works just fine. I would assume none of the pages would work without the reference.

I was posting an edit when you replied shouldn't it be System.Web.UI.WebControls.DataItem instead of System.Web.UI.Control.DataItem