Downgrading .NetFramwork 4.5 to 4.0

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.NET4.5

I downgraded .netFramework version from 4.5 to 4.0 in my Console project , It's not able to load assembly.

Throwing exception:

System.BadImageFormatException : Could not load file or assembly.

Assembly is third party and do work with .Net Framework 2.0

Posted 6-Mar-15 23:10pm

Sunita Rana

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Sergey Alexandrovich Kryukov 7-Mar-15 8:57am

What do you mean by that? I would assume you target some assembly to v.4.0, but then you would probably tell us that you decompiled and then recompiled 3rd-party assembly. You need to tell us what have you done in your project and how.
You should not mix up different things, such as .NET version to which each of the assemblies is targeted, .NET installed on one or some target computers, and so on.
—SA

Atmir 7-Mar-15 12:14pm

Change CPU target to 32BIT and try

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Andreas Gieriet · Answer 1 · 2015-03-07T09:29:00

Solution 1

If you are working on Win8.1, install .Net Framework 3.5 (which includes .Net 2.0 and 3.0).
4.0 is an integral part of 4.5, so you do not need to "downgrade" to 4.0.
See also How to Enable .NET Framework 2.0 and 3.5 in Windows 8.1 for Older Programs[^]
Cheers
Andi

Posted 7-Mar-15 9:29am

Andreas Gieriet

Comments

Sergey Alexandrovich Kryukov 1-Apr-15 12:22pm

Sure, a 5.
—SA

Andreas Gieriet 1-Apr-15 16:11pm

Thanks for your 5, Sergey!
Cheers
Andi