c#: boolean vs bool, String vs string, Int32 vs int

A frequently asked question, what is the difference between a Boolean and a bool object in c#? In short, it's actually the same thing. When compiled to MSIL(Microsoft Intermediate Language), they are referring to System.Boolean, thus there's no implication in performance.

But as a good conventional practice, i always use bool & string as opposed to Boolean & String. Unless you always use System.Int32 instead of int.