ValuesExchange

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

namespace ValuesExchange // обмен значений полей класса
{
    class ClassExchange
    {
        int firstNumber;
        public int FirstNumber
        {
            get
            {
                return firstNumber;
            }
            set
            {
                firstNumber = value;
            }
        }

        int secondNumber;
        public int SecondNumber
        {
            get
            {
                return secondNumber;
            }
            set
            {
                secondNumber = value;
            }
        }

        public static void ExchangeTwoInt(ref int first, ref int second)
        {
            int temp;

            temp = first;
            first = second;
            second = temp;
        }

    }
    class Program
    {
        static void Main(string[] args)
        {
            int first = 0;
            int second = 0;

            ClassExchange firstObject = new ClassExchange();

            Console.Write("Введите первое поле объекта: ");
            first = Convert.ToInt32(Console.ReadLine());

            Console.Write("Введите второе поле объекта: ");
            second = Convert.ToInt32(Console.ReadLine());

            firstObject.FirstNumber = first;
            firstObject.SecondNumber = second;

            Console.WriteLine("\nПоля ДО обмена:");
            Console.WriteLine("Первое поле:{0}\nВторое поле:{1}\n", firstObject.FirstNumber, firstObject.SecondNumber);

            ClassExchange.ExchangeTwoInt(ref first, ref second);

            firstObject.FirstNumber = first;
            firstObject.SecondNumber = second;

            Console.WriteLine("\nПоля ПОСЛЕ обмена:");
            Console.WriteLine("Первое поле:{0}\nВторое поле:{1}\n", firstObject.FirstNumber, firstObject.SecondNumber);

            Console.ReadKey(true);

        }
    }
}