using System;

public class Program

{

    public static void Main()

    {

        int firstInt = 1;

        int secondInt = 2;

        Swap<int>(ref firstInt, ref secondInt);

        Console.WriteLine("firstInt: " + firstInt);

        Console.WriteLine("secondInt: " + secondInt);

        double firstDouble = 1.5;

        double secondDouble = 2.5;

        //Bỏ qua dấu <> vì compiler tự hiểu kiểu double

        //Dựa trên tham số ta truyền vào

        Swap(ref firstDouble, ref secondDouble);

        Console.WriteLine("firstDouble: " + firstDouble);

        Console.WriteLine("secondDouble " + secondDouble);

    }

​

    public static void Swap<T>(ref T a, ref T b)

    {

        T temp = b;

        b = a;

        a = temp;

    }

}