using System;

public class Program

{

    private static void Swap<T>(ref T x, ref T y)

    {

        var temp = x;

        x = y;

        y = temp;

    }

    public static void Main()

    {

        var a = 1;

        var b = 2;

        Console.WriteLine(a + "->" +b);

        Swap<int>(ref a, ref b);

        Console.WriteLine(a + "->" +b);

    }

}