out and ref keyword in c#

out keyword in c#

Before calling the method, variables may be initialize or not. Its depend on programmers.
Initialization must be inside the methods.

namespace ConsoleApplication1
    class OutSwap
        static void Main(string[] str)
            SwapWithout3rd objSwap = new SwapWithout3rd();
            int a, b;
            objSwap.swapMethod(out a, out b);
            Console.WriteLine("A : " + a + ", B: " + b);

    /// <summary>
    /// swap withod 3rd variable using out kye.
    /// </summary>
    public class SwapWithout3rd
        public void swapMethod(out int a, out int b)
            a = 10;
            b = 20;
            a = a + b;
            b = a - b;
            a = a - b;

//Out put  A:20 , B:10


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