title: gRPC support for .NET 3.5 framework
body: <p>According to official grpc <a href="https://grpc.io/docs/quickstart/csharp.html#before-you-begin" rel="nofollow noreferrer">documentation</a>, the grpc for C# requires at least .NET 4.5 framework.</p>
  
  <p>I have a project that should be supported on Windows XP which is running .NET 3.5.</p>
  
  <p>Is there any porting of grpc that can run on .NET 3.5?</p>