It's not a crime, but Allman bracing is normally used. Every official guidelines, every programming book, every open source project I know of, uses Allman for C#, so anything else stands out like a sore thumb. It's about convention, consistency and resulting readability. I'm not a fanboy of bracing style :) I think that in Rome you should do as Romans do. When I use Java or PHP, I use K&R - it's a context thing, it would just look weird and out of place otherwise. I believe it's better to embrace the "native" (common) coding style in each language, unless you only ever work on your own.
Allman bracing sucks on wide screen laptops, and it was only when I found the 3-font point brace line Visual Studio extension that I was able to switch. I'm really getting annoyed with braces, we should get rid of them.
Python replaced them with indentation. Funnily enough it is one of the most complained about things with Python. I hated it at first, and its still a pain when switching between JavaScript and Python, but you never get the mismatched brace problem which more than makes up for the problems.
