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ref keyword in c#

ref keyword in c#

Before calling the method, variables much must be initialized.
Initialization not must inside method.

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            swapWithTrd objswap = new swapWithTrd();
            int a = 5;
            int b = 6;
            objswap.swapMethod(ref a, ref b);

            Console.WriteLine("A : " +a +",  B :" +b);
            Console.ReadLine();
        }
    }

    /// <summary>
    /// Swap  using 3rd variable by ref
    /// </summary>
    public class swapWithTrd
    {
        public void swapMethod(ref int a, ref int b)
        {
            a = 40;
            b = 50;

           int temp = a;
           a = b;
           b = temp;
        }
    }
}


/// Out Put:  A: 50, B: 40
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