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Editorial Team
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Asked: 2026-05-25T21:50:59+00:00

<tt:TooltipExtender ID=teAutoServiceShutdown TargetControlID=cbAutoServiceShutdown Parser Error Message: Could not load file or assembly ‘AjaxControlToolkit, Version=3.0.20820.16598,

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<tt:TooltipExtender ID="teAutoServiceShutdown" TargetControlID="cbAutoServiceShutdown"

Parser Error Message: Could not load file or assembly ‘AjaxControlToolkit, Version=3.0.20820.16598, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e’ or one of its dependencies. The located assembly’s manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

what to do?

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  1. Editorial Team

    Few possible ways:

    1. Read How the Runtime Locates Assemblies and then try to figure out whether an assembly is referenced correctly and is in any of the expected path (basically you can manually go through the assembly resolving steps yourself and see whether you are able to find reference yourself 😉 )
    2. Remove a reference from project file (and I believe web.config), cleanup solution, add reference again
    3. Build project manually using msbuild YourSolution.sln /v:diag > log.txt command line and then see generated log.txt file for any issues while an assembly reference resolving
    4. Use filemon tool to see where Visual Studio trying to find a file
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