Badimageformatexception: cannot load a reference assembly for execution.

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I am running asp.net client for wcf, but face with the Exception that I can't really cope with.

BadImageFormatException: Could not load file or assembly 'System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Reference assemblies should not be loaded for execution. They can only be loaded in the Reflection-only loader context.

What I have tried:

Tried to remove bin folder and rebuild project as someone recommended, but nothing changed

Posted 11-Jul-20 15:28pm

triyul22

Updated 8-Dec-20 18:18pm

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Sandeep Mewara 12-Jul-20 4:07am

Are you using IIS? Also, Which version of .NET Framework you are using?

triyul22 12-Jul-20 23:36pm

Yes, IIS, using 3.1.0 version

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Dave Kreskowiak · Answer 1 · 2020-07-12T06:39:00

This is most commonly because your code is running as one architecture (32- or 64-bit) and a .DLL you're trying to load is a different architecture.

The C# code you're writing, by deafult, can run either 32-bit or 64-bit at runtime. In the Project Properties, Build tab, the target is going to say "AnyCPU". Change that to x86 to force your code to run as 32-bit only.

You MAY have to make a configuration chance to the Application Pool you're running your code under also expect to run 32-bit code. I can't remember off the top of my head what the exact option name is, but it's in the Advanced properties of the application pool you're using.