How to use C# 6 with Web Site project type?

Question

Updated an existing Web Site project type Visual Studio 2015, I changed the Framework to 4.6.

I then expected to have all those new features available in my

Answer 1

I've tested this with ASP.NET MVC 5 (tested 5.2.3), and your mileage may vary with other web frameworks, but you just need to add the Roslyn CodeDOM| NuGet package

CodeDOM Providers for .NET Compiler...

Replacement CodeDOM providers that use the new .NET Compiler Platform ("Roslyn") compiler as a service APIs. This provides support for new language features in systems using CodeDOM (e.g. ASP.NET runtime compilation) as well as improving the compilation performance of these systems.

PM> Install-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform

https://www.nuget.org/packages/Microsoft.CodeDom.Providers.DotNetCompilerPlatform/

The NuGet package should add the DLL files and add the following to your web.config.

If it's still missing. Try adding yourself.