When does it matter whether you use int versus Int32, or string versus String?

Question

In C#, the keywords for built-in types are simply aliases for corresponding types in the System namespace.

Generally, it makes no difference whether yo

Answer 1

One issue is that with strange usings or member declarations String/Int32 can map to a different type(i.e. not the one from mscorlib) or even another kind of member, which would lead to problems.

As Jon mentioned, another issue is that you can't declare enums using an identifier(You get the error "Type byte, sbyte, short, ushort, int, uint, long, or ulong expected").