C# Program for Reference Data-Type

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



class Program

{
public static void value(int num)
      {
        num++;
      }
     public static void reference(ref int num)
      {
        num++;
      }
 
     static void Main(string[] args)
      {
        int num;
        Console.Write("Enter a number:\t");
        num = Convert.ToInt32(Console.ReadLine());
        Console.WriteLine("\n\n\tValue Type");
        Console.WriteLine("----------------");
        Console.Write("\nPrevious Value:\t{0}", num);
        Program.value(num);
        Console.Write("\nCurrent Value:\t{0}", num);
           
        Console.WriteLine("\n\n\n----------------");
        Console.WriteLine("\tReference Type");
        Console.WriteLine("--------------------");
        Console.Write("\nPrevious Value:\t{0}", num);
        Program.reference(ref num);
        Console.Write("\nCurrent Value:\t{0}", num);
        Console.ReadLine();
      }
   }
}

Output :