My take is that you're thinking like a web dev, and not like a desktop dev.
Why would you want to use 2 languages? If you use a single language, testing/debugging is waaaay easier.
There may be some places where you'd be inclined to use another language for speed, but that's where the .net ecosystem comes into play. Even then, with proper profiling, you'll usually find that you don't need to switch language.
There may be some places where you'd be inclined to use another language for speed, but that's where the .net ecosystem comes into play. Even then, with proper profiling, you'll usually find that you don't need to switch language.