Operations Problem?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Operations
{
    class Program
    {
        static void Main(string[] args)
        {
            int numberOne = int.Parse(Console.ReadLine());
            int numberTwo = int.Parse(Console.ReadLine());
            string operation = Console.ReadLine();
            int result = 0;
            string evenOrOdd = null;

            if (operation == "+" || operation == "-" || operation == "*")
            {
                if (operation == "+")
                {
                    result = numberOne + numberTwo;
                }
                else if (operation == "-")
                {
                    result = numberOne - numberTwo;
                }
                else if (operation == "*")
                {
                    result = numberOne * numberTwo;
                }

                if (result % 2 == 0)
                {
                    evenOrOdd = "even";
                }
                else
                {
                    evenOrOdd = "odd";
                }

                Console.WriteLine("{0} {1} {2} = {3} - {4}", numberOne, operation, numberTwo, result, evenOrOdd);
            }

            if (operation == "/" || operation == "%")
            {
                if (numberTwo == 0)
                {
                    Console.WriteLine($"Cannot divide {numberOne} by zero");
                }
                else if (operation == "/")
                {
                    Console.WriteLine($"{numberOne} / {numberTwo} = {(double) numberOne / numberTwo}");
                }
                else if (operation == "%")
                {
                    Console.WriteLine($"{numberOne} % {numberTwo} = {numberOne % numberTwo}");
                }
            }
        }
    }
}