How do I disable C# 6 Support in Visual Studio 2015?

Question

Background

We have a project that we\'re developing in VS 2015 with C#6 enabled that occasionally needs to be opened by developers using VS 2013 without C#6.

Answer 1

You can set the language feature for all the solutions/csproj with the MSBuildUserExtensionsPath.

Search the value of the $(MSBuildUserExtensionsPath), it should be something like C:\Users\$(User)\AppData\Local\Microsoft\MSBuild

Then edit the file Force.LangVersion.ImportBefore.props in the folder $(MSBuildUserExtensionsPath)\14.0\Imports\Microsoft.Common.Props\ImportBefore with :

  
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