Tracing log for user doing transaction

I want all of you help to create file log for tracing user transaction. I want to do that when a user wants to update or add some information, I want to trace w开发者_高级运维hich information that user was updated.

The tracing file that I want is easy read and search. Even, it is in text file or xml file.

Thanks, Sopolin

---

System.Diagnostics.TraceSource is a good place to start looking.