How to change the VB.NET language version in Visual Studio 2015

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The VB.NET compiler has the /langversion option for this. Also supported by MSBuild. But not by the IDE, that makes it awkward to change it.

Still possible, you have to edit the .vbproj file. Use a text editor, Notepad will do. And copy/paste this snippet, insert it in the 4th line so it is effective for all configurations and platforms:

  <PropertyGroup>
     <LangVersion>12</LangVersion>
  </PropertyGroup>

And double-check that it is effective:

Module Module1
    Sub Main()
        Dim test As String
        Console.WriteLine(NameOf(test))
    End Sub
End Module

Output:

error BC36716: Visual Basic 12.0 does not support 'nameof' expressions.

Well, that works, also flagged by IntelliSense with red squiggles. You probably want to create your own project templates so you don’t have to do this over and over again. Use File > Export Template.

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