mixed mode assembly is built against version '2.0.50727'

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Hi all,
I am having some problems. I have a windows application is written in vs 2005 then I converted into VS2010. I can't run the application because of assembly problem. when I run it says,"Mixed mode assembly is built against version'v2.0.50727' of hte runtime and cannot be loaded in teh 4.0 runtime without additional configuration information."

I googled it found some clue but did not help. I don't even have idea what to do.
thanks all.

Posted 15-Feb-11 4:07am

jashimu

Updated 5-Dec-18 22:45pm

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Nish Nishant 15-Feb-11 10:21am

Updated my answer.

2 solutions

Solution 3

The exception clearly identifies some .NET 2.0.50727 component was included in .NET 4.0. In App.config file use this:

<startup useLegacyV2RuntimeActivationPolicy="true" />

Posted 5-Dec-18 22:46pm

Pawar.Nilesh

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Nish Nishant · Accepted Answer · 2011-02-15T04:08:00

Solution 1

It seems that your C# project references a C++/CLI project that has not yet been updated to .NET 4.0.

[Edit]
~~~~~~~

Open your C++/CLI project in VS 2010 and build it again. And then make sure your C# project is referencing the new DLL and not the old one.

[Edit 2]
~~~~~~~~~

This is in response to SA's comment:

You can only add a reference to the same runtime version. .NET 2.0, 3.0 and 3.5 are all under the 2.0 runtime, so they can be used with each other. .NET 4.0 uses an entirely new 4.0 runtime and so you cannot mix references with older versions.

Posted 15-Feb-11 4:08am

Nish Nishant

Updated 15-Feb-11 9:37am

v4

Comments

Sandeep Mewara 15-Feb-11 10:13am

Comment from OP:
Nishant, thanks for your quick reply. You are right. what should I do. My solution has two project one is in C# another is in C++/CLI.

thanks again.

Sergey Alexandrovich Kryukov 15-Feb-11 15:30pm

Nishant, this is weird. Normally, you can reference an assembly compiled for lower version of .NET. Maybe, this is a peculiarity of mixed-mode only, what do you think?
--SA

Nish Nishant 15-Feb-11 15:35pm

You can only add a reference to the same runtime version. .NET 2.0, 3.0 and 3.5 are all under the 2.0 runtime, so they can be used with each other. .NET 4.0 uses an entirely new 4.0 runtime and so you cannot mix references with older versions.

jashimu 16-Feb-11 11:18am

Nishant, I still have the problem. I could not solved it. I don't what else I should try.

Nish Nishant 16-Feb-11 11:39am

If you are sure you rebuild the C++/CLI DLL as .NET 4.0, then if you still get the same error you can be reasonably sure you are somehow using the old DLL.

Try copying the C# and C++/CLI DLL to a fresh machine to see if you get the error.

jashimu 16-Feb-11 11:44am

I am using sqlite as database. Do you think sqlite dll does not work on 4.0. I don't see anything else I am doing wrong.

Nish Nishant 16-Feb-11 11:45am

I believe sqllite is purely native, so I don't think it's a factor.

Espen Harlinn 16-Feb-11 15:24pm

sqlite can be compiled as a managed assembly :)

I think OP should take a look at http://system.data.sqlite.org/index.html/doc/trunk/www/index.wiki

for managed only version : http://sqlite.phxsoftware.com/

Nish Nishant 16-Feb-11 15:29pm

Ah okay, so it's possible that the version he's using is compiled for .NET 2.0. That might be it, Espen.