Swap Too Numbers

StartUp.cs

using System;

namespace SwapTooNumbers
{
    public class StartUp
    {
        // How to swap to numeric values
        public static void Main(string[] args)
        {
            int first = 1;
            int second = 2;

            // with temp variable
            Console.WriteLine("Swap with temporary variable: ");
            SwapWithTempVariable(first, second);

            // without temp variable - XOR(^)
            Console.WriteLine("Swap without temp variable using XOR(^): ");
            SwapWithXOR(first, second);

            // with only plus and minus
            Console.WriteLine("Swap without temp variable using plus(+) and minus(-): ");
            SwapWithPlusAndMinus(first, second);
        }

        private static void SwapWithPlusAndMinus(int first, int second)
        {
            first = first + second;
            second = first - second;
            first = first - second;

            PrintResult(first, second);
        }

        private static void SwapWithXOR(int first, int second)
        {
            first = first ^ second;
            second = second ^ first;
            first = first ^ second;

            PrintResult(first, second);
        }

        private static void SwapWithTempVariable(int first, int second)
        {
            var temp = first;
            first = second;
            second = temp;
            
            PrintResult(first, second);
        }

        private static void PrintResult(int first, int second)
        {
            Console.WriteLine(first);
            Console.WriteLine(second);
        }
    }
}