public void Call_Add_Static_Optional_Parameters()
        {
            int sum14 = MathClass.Add(4);

            int sum15 = MathClass.Add();

            int sum9 = MathClass.Add(number2: 4);
        }
        public void Call_Add_Static_Named_Parameters()
        {
            int sum9 = MathClass.Add(5, 4);

            int sum12 = MathClass.Add(number1: 6, number2: 6);

            int number = 5;
            int sum13  = MathClass.Add(number, number2: 8);

            int sum15 = MathClass.Add(5);
        }