I use C# because it has enterprise loving ecosystem, which allows write code and not think too much about updating it. As language itself, I start using it when it comes out, and it was easier for me to use as beginner, instead of C++. After that it slowly moving to the C++ direction, but I already know it, and it has Visual Studio which significantly favor in C# selection. I'm big fan of IDE-supported refactoring across whole software systems, and only VS and Idea gives me that tooling.