using System;

public class Program

{

    class A {

        public int MyField {

            get => myField;

            set {

                myField += value;   

            }

        }

        private int myField;

    }

    public static void Main()

    {

        var a = new A();

        a.MyField++;

        Console.WriteLine(a.MyField);

        var b = new A();

        b.MyField += 10;

        b.MyField += 10;

        Console.WriteLine(b.MyField);

    }

}