Could not load file or assembly 'AjaxControlToolkit,

Question

<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?

Well, I really don't know what kind of answer you expect to a question like this other than: reference the 'AjaxControlToolkit, Version=3.0.20820.16598, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e' assembly to your project or put it in the GAC. — Darin Dimitrov
– Darin Dimitrov, Commented Sep 25, 2011 at 19:43

timbck2 · Accepted Answer · 2012-06-25 17:14:24Z

2

I know this question is nearly a year old, but I just ran into this problem myself. I solved it by simply doing "Build -> Clean Solution" which I guess cleared the assembly cache.

answered Jun 25, 2012 at 17:14

timbck2

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sll · Accepted Answer · 2011-09-25 19:47:03Z

1

Few possible ways:

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 ;) )
Remove a reference from project file (and I believe web.config), cleanup solution, add reference again
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
Use filemon tool to see where Visual Studio trying to find a file

answered Sep 25, 2011 at 19:47

sll

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2 Comments

senzacionale Over a year ago

i change AjaxControlToolkit from old version to new one. I add new reference to project and i get this error. In web.config is only this <add tagPrefix="ajax" namespace="AjaxControlToolkit" assembly="AjaxControlToolkit" />

sll Over a year ago

@senzacionale : have you checked whether this assembly in GAC and if so -whether version is latest? Also see web project csproj file, it should contains something like <HintPath>..\..\..\..\ThirdParty\AjaxControlToolkit\AjaxControlToolkit.dll</HintPath> with CORRECT hint path

RAM · Accepted Answer · 2016-03-11 15:16:44Z

The build Output window should give you a fix/workaround for this problem.

Clean and rebuild the solution.

Examine the contents of the Output window, look for this text:

Consider app.config remapping of assembly "AjaxControlToolkit, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e" from Version "4.1.40412.0" [C:\Visual Studio\App\Lib\bin\Debug\AjaxControlToolkit.dll]

Following this there will be a fragment you can paste into the <assemblyBinding> section of your web.config.

C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Common.CurrentVersion.targets(1819,5): warning MSB3247: 
Found conflicts between different versions of the same dependent assembly. 
In Visual Studio, double-click this warning (or select it and press Enter) to fix the conflicts; 
otherwise, add the following binding redirects to the "runtime" node in the application configuration file: 
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
    <dependentAssembly>
        <assemblyIdentity name="AjaxControlToolkit" culture="neutral" publicKeyToken="28f01b0e84b6d53e" />
        <bindingRedirect oldVersion="0.0.0.0-16.1.0.0" newVersion="16.1.0.0" />
    </dependentAssembly>
</assemblyBinding>

Once you paste that in and rebuild it should automatically reference the version of the Toolkit specified as the newVersion.

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