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Multicast Delegate in C sharp #

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

namespace My
{
  //  public delegate int del(int a, int b);
    public delegate void del(int a,int b);
    class MyClass
    {
     //static  int sum (int a, int b)
    static void sum(int a,int b)  
    {
          Console.WriteLine((a+b));
   
       // return (a+b);
        }

      //  static  int minus (int a, int b)
    static void minus(int a, int b)  
        {
       Console.WriteLine((a-b));
   
      //  return (a-b);
        }


        MyClass(int y)
        {

        }
        static void Main(string[] args)
        {
            del ob = new del(sum);
        //    Console.WriteLine("delegate received "+ob(45, 40));
            ob(45, 40);
            ob += new del(minus);
           // Console.WriteLine("delegate received " + ob(45, 40));
            ob(45, 40);
            ob -= new del(minus);
           // Console.WriteLine("delegate received " + ob(45, 40));
            ob(45, 40);
            Console.Read();


           

        }


    }
}

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