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Asked: 2026-05-11T07:57:58+00:00

I get the following error message trying to run my page Compiler Error Message:

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I get the following error message trying to run my page

Compiler Error Message: CS0433: The type 'usercontrols_BirthDetails' exists in both 'c:\windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\5c377e82\1f883022\App_Web_ub0hcxgl.dll' and 'c:\windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\5c377e82\1f883022\App_Web_3ndqr5wn.dll'

The code works okay on my machine, and fails on the server as above.

Sometimes this happens on my machine, but I can fix it by closing visual studio and re-starting it. So I guess it’s some conflict that happens due to some compilation mistake that ASP.Net is making.

My question is, how can I fix this on my server without rebooting it.

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1 Answer

  1. Well, I did solve the problem, but the root cause was something else… Apparently it had something to do with declaring a variable of my usercontrol’s type. For some reason this wasn’t agreeing with ASP.Net on the server (though it was well-digested on my own machine)… I don’t have any idea why exactly this was happening but this clue is a signal to Jon Skeet to step in and describe the thing in technical mumbo-jumbo.

    The solution in my case was to remove the usercontrol variable declaration. I got by with a workaround.

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