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    If the Additional class is not sealed, you can create a derived class that inherits from Additional and add the new properties you need.
    – Md Farid Uddin Kiron
    Commented Jul 5 at 7:31
  • Aparat from that, Instead of extending the Additional class, you can create a new class that contains an instance of Additional and adds the new properties you need. Extension method or wrapper both can handle that.
    – Md Farid Uddin Kiron
    Commented Jul 5 at 7:34