dotnet try test

program.cs

class Program
    {
        static void Main(string[] args)
        {
            new OperationDemo().Run();
        }
    }
    public class Expression
    {
        public string Operator { get; set; }

        public int Arg1 { get; set; }

        public int Arg2 { get; set; }

        public override string ToString()
        {
            return $"{Arg1} {Operator} {Arg2}";
        }
    }
    
    class OperationDemo
    {
        public void Run()
        {
            var expression = new Expression()
            {
                Arg1 = 10,
                Arg2 = 5,
                Operator = "/"
            };

            CSharp1(expression);
        }

        void CSharp1(Expression ex)
        {
            int result = 0;

            switch (ex.Operator)
            {
                case "+":
                    result = ex.Arg1 + ex.Arg2;
                    break;
                case "/":
                    if (ex.Arg2 == 0)
                    {
                        throw new ArgumentException("Arg2 cannot be 0");
                    }
                    result = ex.Arg1 / ex.Arg2;
                    break;
                default:
                    throw new InvalidOperationException();
            }

            Console.WriteLine($"{ex} = {result}");
        }
        }