There is nothing magical about attributes in C#, they are a well defined way to declaratively add meta data to your methods, and I've always found them quite useful and effective.

Here are a few links that may be insightful on how they work:

http://oreilly.com/catalog/progcsharp/chapter/ch18.html

http://msdn.microsoft.com/en-us/library/aa288454%28v=vs.71%2...

http://www.codeproject.com/Articles/2933/Attributes-in-C