Removing roslyn from ASP.NET 4.5.2 project template

If you're using VS 2015 for development, ASP.NET projects now use Roslyn by default. The host I use as a test server doesn't support Roslyn / C# 6.0 yet. Though the website gets published successfully (using Web Deploy), I end up with an Internal Server Error.

According to this, roslyn support is added using a nuget package. So the first thing to do, is to remove the package. Open the Package Manager Console and type the following one line at a time:

uninstall-package Microsoft.CodeDom.Providers.DotNetCompilerPlatform  
uninstall-package Microsoft.Net.Compilers  

Now, remove the following code from web.config:

  <system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701" />
      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
    </compilers>
  </system.codedom>

That's it.

Obviously, your code shouldn't be using any C# 6 feature at this point.