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

Right click on Project in Project Explorer and select Properties.

When the Properties tab opens select Build and the click the Advance button in bottom right.

There is drop-down box called Language Version. Change the select to "C# 5.0"