Pass by Reference using ref keyword

You can use the keyword ref in csharp to pass a value by reference instead of call by value .

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

namespace Namespace1
{
    class Student
    {
        public string StudentName { get; set; }
        /* usage of the pass by reference using the keyword ref */
        public void Add(ref int i)
        {
            i = i + i;
        } 
    }
    class Program
    {
        public static void Main()
        {
            Student studentObj = new Student();

            int i = 10;

            Console.WriteLine("i = : " + i);

            studentObj.Add(ref i); 

            Console.WriteLine("i: " + i);
        }
    }
}