Project reference work-around .net 4.5 and .net 3.5

Question

In continue for this thread:
Mixing .NET 3.5 with 4/4.5 assemblies in the same solution/project

I found a workaround:
http://social.msdn.microsoft.com/Foru

Answer 1

Your configuration file will load .NET 2.0 runtime and it would fail at some point loading .NET4.5 components. You really want your app to run in .NET4.5 runtime and be able to load 3.5 components. You should try following config file.

<configuration>
    <startup useLegacyV2RuntimeActivationPolicy="true">
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
    </startup>
</configuration>