Apart from a tiny number of very simple ones for the 360 that might have been written in C# and XNA. And even then all of the ones that might get ported to another console or use a cross platform engine are written in C++.
Also, major AAA commercial games have their own (in-house) managed code/scripting language (e.g. UnReal engine has UnRealScript, Quake has QuakeScript)
Apart from a tiny number of very simple ones for the 360 that might have been written in C# and XNA. And even then all of the ones that might get ported to another console or use a cross platform engine are written in C++.