What's the difference between [Something] and [SomethingAttribute] [duplicate]

Answer 1

Both are same in the context where attribute declaration goes. Former is shorter form of latter. But it does makes the difference inside a method.

For example if you say typeof(DefaultValue) in some method, that won't compile. You'll have to say typeof(DefaultValueAttribute) instead.

private void DoSomething()
{
    var type = typeof(DefaultValue);//Won't compile
    var type2 = typeof(DefaultValueAttribute);//Does compile
}