App.config and .NET version

[IlyaRabyy]

Colleagues,
I'm working on a project in VB .NET, VS 2012, and here's what's in the App.config:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
</configuration>

All fine and dandy, but... (there's always "but", isn't there? ;-) ) ... this program is supposed to work on an "older" Win Server version, which takes only up to .NET v. 4.0.
I'm gonna keep an eye on the .NET components I shall use, of course, but ... (see above )... if I change it to "Version=v4.0" - would the VS throw a warning like "not compatible with version 4.0" or something like that if I try to use some function/object/method/property that appears only in .NET version "younger" than 4.0?

Regards,

Ilya

 

[strongm]

https://docs.microsoft.com/en-us/vi...-version-of-the-dotnet-framework?view=vs-2015

 

[IlyaRabyy]

Great!
Thank you!


Regards,

Ilya