perform swapping in C#

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

namespace swaping
{
    class Program
    {
       
            void swapNum(ref int a,ref int b)
            {
                int temp;
                temp=a;
                a=b;
                b=temp;
            }
        static void Main(string[] args)
        {
            Program num = new Program();
            int number1, number2;
            Console.WriteLine("enter the  first no");
            number1 = Convert.ToInt16(Console.ReadLine());
            Console.WriteLine("enter the second no");
            number2 = Convert.ToInt16(Console.ReadLine());
            Console.WriteLine("**********The value before swapping*********** ");
            Console.WriteLine("the value of first no is{0}", number1);
            Console.WriteLine("the value of second no is{0}", number2);
            num.swapNum(ref number1, ref number2);
            Console.WriteLine("**********The value after swapping**********");
            Console.WriteLine("the value after swapping is{0}", number1);
            Console.WriteLine("the value after swapping is{0}", number2);
            Console.ReadLine();

        }
    }
}