How to prevent Visual Studio to prompt to upgrade projects .NET 4 to .NET 4.5

Question

I have a solution in with project in C#, C++/CLI targeted to .NET 4 and with some dependencies in .NET4. When I open this solution in Visual Studio 2013 it prompts for upgra

Answer 1

Put the following line in the global property section of your project file.

NoUpgrade

in context:

    ...
    NoUpgrade

Works for Visual Studio 2015 & 2017 as well.

You will need to remove it when you want to do the upgrade.

Source: https://blogs.msdn.microsoft.com/dsvc/2015/12/13/migration-from-vs2012-to-vs2015-ide-only-throws-compiler-upgrade-warning/