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

The only situation I can think of in which you are required to use the aliases in a form where you might otherwise be able to use a class name is in the definition of enum types:

public enum MyEnum:Byte //will not compile

public enum MyEnum:byte //correct

Notice also that the definition of an enum requires use of the alias keyword, while when defining code members that can accept any enumerated type, you use the class name Enum.

Lastly, you can never specify System.ValueType as a base class or generic type parameter; you instead use the struct keyword, which is essentially an alias for an object deriving from ValueType.