The https://github.com/LindaLawton/Google-Dotnet-Samples repository contains samples by Linda Lawton. Google has not created these sample projects, or the tutorials that go along with them; they are entirely unofficial in that sense, and Google takes no responsibility for their accuracy. That said, you may well still find them useful.
googlearchive/google-api-dotnet-client-samples
Samples of using the Google APIs Client Library for .NET
C#Apache-2.0