Can we declare structure as protected in C#?

Answer 1

is YES, BUT only as an inner class. A 'normal' class cannot be protected or private.

// 'Normal' class - only default or public allowed

public class ProtectedOrNot {

  // Inner class - public, default, protected, private allowed

  protected class InnerClass {

  }

  public static void main(String[] args) {

  }

}