>then it should state that.
It will be ignored. StackOverflow guys and all participants have put an enormous effort into making it at least partially trusted source of snippets, and I hope it will never be outranked by sites like this.
(to creator: sorry for this, but in a long run it only harms everyone, unless you “die” for it)
If "idioms" mean code that adheres to best practices, given that C# code is frequently threaded, their examples should mitigate common threading issues.