using System;

​

public class Program

{

    static void Main(string[] args)

    {

        var one = new Foo{X = 1, Y = 2};

        var two = one;

        Console.WriteLine($"variables 'one' == 'two'  (expected true): {one == two}");

        Console.WriteLine($"variables 'one' != 'two' (expected false): {one != two}");

        two.X = 2;

        Console.WriteLine($"variables 'one' == 'two' (expected false): {one == two}");

        Console.WriteLine($"variables 'one' != 'two'  (expected true): {one != two}");

    }

}

​

public struct Foo

{

    public int X { get; set; }

    public int Y { get; set; }

​

    // public static bool operator ==(Foo c1, Foo c2) { return c1.X == c2.X && c1.Y == c2.Y; }

    // public static bool operator !=(Foo c1, Foo c2) { return !(c1 == c2); }

} 

​

​