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    namespace NS;
    static partial class C {
        // Your methods here
    }

    namespace Math;

    static class Adder {
      public static int Add(...) { ... }
    }

    namespace Whatever;
    using static Math.Adder;

    class CC {
      void M() {
        var z = Add(10, 20); // no NS qualification needed due to using static above
      }
    }

    void DoSomething(...) {
        throw SomeException(...);
    }

    void DoSomething(IErrorConditions ec, ...) {
        ec.Report(...);
    }