Out keyword c#.net | how to use out keyword in C#.

Out keyword c#.net

It is bit different from normal variable passing through method and ref value passing through method. Using out keyword we can use variable with out initializing.  Please see below example. i have not initialize the SeconeNumber, still we can use that.

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

namespace OOPSConcepts
{
    class Program
    {
        static void Main(string[] args)
        {
//variable is not initialized before calling the method. 
            int SeconeNumber;
            int result = 0;
            result = Add(out SeconeNumber);
            Console.WriteLine(result);  //output 40
            Console.WriteLine(SeconeNumber); //output 20
            Console.Read();

        }
        public static int Add(out int secondNumber)
        {
//Here we are initializing the variable.
            secondNumber = 20;
            return secondNumber +20;
        }
    }
}


output : 

40 
20

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