csharp/src/Directory.Build.props - third_party/github/protocolbuffers/protobuf - Git at Google

 <Project>

   <PropertyGroup>
     <LangVersion>10.0</LangVersion>
   </PropertyGroup>

 </Project>
	<Project>

	<PropertyGroup>
	<LangVersion>10.0</LangVersion>
	</PropertyGroup>

	</Project>