Journal: Is most game development done in C++? What about C#?

I've been searching for a game programming book on Amazon, but it looks like the majority of them are for C++ developers. The only C# books I saw were beginner's books, and they seemed dated, and not that useful, judging by the ratings. Is there a reason there aren't many C# game programming books? Does this have something to do with the language? Is C++ better for game programming? What about XNA? That seems to work exclusively with Visual Studio C# Express Edition, and it looks like there are some books coming out at the tail end of this year for it. Thoughts?