Not sure what you mean about C# on Linux. More than a decade ago it worked just fine on Linux using Mono. For a few years now it's worked just as well on Linux

Not sure what you mean about C# on Linux. More than a decade ago it worked just fine on Linux using Mono. For a few years now it's worked just as well on Linux as it has on Windows, using dotnet Core. Source: I've been developing using C# on both Windows and Linux for a very long time.