using System;

public class Program

{

    public struct Foo

    {

        public int Value;

        public void Change(int newValue) 

        {

            Value = newValue;

        }

    }

    public class Bar

    {

        public Foo Foo1;

        public Foo Foo2

        {

            get => Foo1;

            set => Foo1 = value;

        }

    }

    public static void Main()

    {

        var bar = new Bar

        {

            Foo1 = new Foo(),

            Foo2 = new Foo(),

        };

        bar.Foo1.Change(1);

        bar.Foo2.Change(2);

        Console.WriteLine(bar.Foo1.Value);

        Console.WriteLine(bar.Foo2.Value);

    }

}