using System;

public struct A {

    public int x;

    public A Modify(int value) {

        var temp = this;

        temp.x = value;

        return temp;

    }

}

​

public class Program

{

    public static void Main()

    {

        var a = new A();

        a.x = 5;

        Console.WriteLine("a.x: " + a.x);

        var b = a;

        b.x = 7;

        var c = b.Modify(10);

        Console.WriteLine("After modified");

        Console.WriteLine("a.x: " + a.x);

        Console.WriteLine("b.x: " + b.x);

        Console.WriteLine("c.x: " + c.x);

    }

}