Why are there no modifiers (public, private, protected) before the methods and properties that define the interface?

Question

Possible duplicate:
Is there a reason why you cannot define an access modifier for a method or interface?

Hello,

I'm interested in interfaces. Say I have the following interface definition

public interface IPersone
{
  string FirstName { get; set; }
  string LastName { get; set; }
  int CalculateAge(int YearOfBirth);
}

Why are there no modifiers (public, private, protected) before the methods and properties that define the interface? Is there a reason for this?

thanks for the help

Answer 1

Quote from MSDN : members of an interface are always open, because the purpose of an interface is to include other types to access a class or structure.

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Answer 5

http://en.wikipedia.org/wiki/Interface

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