You only need to go through these steps if you are planning to develop gRPC C#. If you are a user of gRPC C#, go to Usage section above.
Windows, Linux or Mac OS X
The easiest way to build is using the run_tests.py script that will take care of building the grpc_csharp_ext native library:
# from the gRPC repository root
$ python tools/run_tests/run_tests.py -c dbg -l csharp --build_onlyOS: win10 x64python 3.6.1