Exchange Variable Values

using System;

namespace ExchangeVariableValues
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            var a = int.Parse(Console.ReadLine());
            var b = int.Parse(Console.ReadLine());

            Console.WriteLine("Before:");
            Console.WriteLine($"a = {a}");
            Console.WriteLine($"b = {b}");

            var c = a;
            a = b;

            Console.WriteLine("After:");
            Console.WriteLine($"a = {a}");
            Console.WriteLine($"b = {c}");
        }
    }
}