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Editorial Team
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Asked: 2026-06-03T02:29:31+00:00

I am trying to use Ajax control toolkit in asp.net website. I copied the

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I am trying to use Ajax control toolkit in asp.net website. I copied the dll from one of my previous sample project. It has the following details

Assembly Version – 3.5.40412.0
File Version - 3.5.40412.2
Internal Name: Ajax Control Toolkit
Language : Neutral
Product Version - 3.5.40412.2

When I add reference to this assembly, it appears as “AjaxControlToolkit-3.5.40412.2” in the reference list. When I run the solution, I get a FileLoadException:

Could not load file or assembly ‘AjaxControlToolkit-3.5.40412.2’ or one of its dependencies.

The located assembly’s manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

I think the problem is with the difference in Assembly version and File version. Is it so? How can we overcome it?

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1 Answer

  1. Editorial Team

    Edit the web.config file to remove the reference, which is not required for normal operation:

    1 – Open the web.config file in the root of your site

    2 – Find the following line and comment it out():xxxxx-is your assembly name.

    <add assembly="xxxxx", Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

    3 – Save and close the web.config file and try again

    Ref Link : http://manual.aspdotnetstorefront.com/p-1118-could-not-load-file-or-assembly-microsoftwebservices3-version3000-cultureneutral-publickeytoken31bf3856ad364e35.aspx

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