I don't really believe there is any BEST way to case variables and methods. What matters is that you and your team are consistent. The .NET naming conventions are great the way Microsoft specifies them, but some people prefer other conventions...
As a personal aside, I tent to prefix private variables and methods with "_" and then camel casing, protected variables and methods in camel casing and public variables and methods with pascal casing, but that is just me.
