C# multitarget platform dll

I have problem with using C# dll on 3.5 and 4.5 platform. I have main app (unmanaged code) which use C# dll. And i need to target my dll to both 3.5 and 4.5 platforms.
For C# exe application i’ve used app.exe.config file like

<?xml version="1.0"?>
    <supportedRuntime version="v2.0.50727" />
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0,Profile=Client"/>

I’ve tried to put it in dll folder, in main app folder with lib_name.config.dll and main_app.config.exe name. But it still doesn’t work.
I should target single dll to both platform (so i can’t use only 3.5 or 4.5 framework).
How can i use config file for dll?

Source: dll

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