using System;

public class Program

{

    public static void Main()

    {

        int[] grades= new int[2];

        grades[0]=50;

        Console.WriteLine("my array  method before :{0}",grades[0]);

        myarraymethod(grades);

        Console.WriteLine("my array  method after :{0}",grades[0]);

    }

    public static void myarraymethod(int[] grades){

        grades[0]+=20;

        }

    }

//pass by refrence