Home work - swap string

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Home_Work
{
    class Program
    {
        static void Main()
        {
            string name = "Пупковицкий";
            string surname = "Василий";

            ShowFullName(name, surname);
            SwapString(ref name, ref surname);
            ShowFullName(name, surname);
        }

        static void SwapString(ref string string1, ref string string2)
        {
            string tempString = string1;
            string1 = string2;
            string2 = tempString;
        }

        static void ShowFullName(string name, string surname)
        {
            Console.WriteLine(name + " " + surname);
        }
    }
}