Mixed mode assembly is built against version '2.0.50727' in C#

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Hi all,
I am having some problems. I have a windows application is written in vs 2012 with .Net Framework 4.5, when I open the crystal reports I can't view the report 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."

What I have tried:

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

C#

<startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
  </startup>

Posted 12-Jun-18 22:32pm

Member 13870765

Updated 14-Jun-18 7:51am

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Richard Deeming · Answer 1 · 2018-06-14T07:51:00

Solution 1

XML

<startup useLegacyV2RuntimeActivationPolicy="true">

F# Scripting, .NET 4.0 and Mixed-mode assemblies – Sharp Things[^]

Posted 14-Jun-18 7:51am

Richard Deeming