swapping values

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

namespace Основы.Практика
{
    class Program
    {
        static void Main()
        {
            string firstName = "Ivanov";
            string lastName = "Ivan";

            Console.WriteLine($"Имя: {firstName}. Фамилия: {lastName}.\n");

            string tempName = lastName;
            lastName = firstName;
            firstName = tempName;

            Console.WriteLine($"Имя: {firstName}. Фамилия: {lastName}.");
        }
    }
}