Exchange Variable Values

using System;

namespace P07_ExchangeVariableValues
{
    class Program
    {
        static void Main(string[] args)
        {
            int num1 = int.Parse(Console.ReadLine());
            int num2 = int.Parse(Console.ReadLine());
            bool isBefore = true;
            OutputTwoNumbers(num1, num2, isBefore);
            SwapIntValues(ref num1, ref num2, ref isBefore);

        }
        static void OutputTwoNumbers(int num1, int num2, bool isBefore)
        {
            Console.WriteLine("Before:");
            Console.WriteLine($"a = {num1}");
            Console.WriteLine($"b = {num2}");
        }
        static void SwapIntValues (ref int num1, ref int num2, ref bool isBefore)
        {
            Console.WriteLine("After:");
            Console.WriteLine($"a = {num2}");
            Console.WriteLine($"b = {num1}");
        }
    }
}