Example Program using Delegates and Events in C#

 A Delegate is a type that references a method. if a delegate references only one method it is called Single Cast Delegate and if delegate references more than one method it is called Multi Cast delegate.

When a Multi Cast Delegate is called, all the methods that are referenced by Multi Cast delegate are called.

An event should be declared as a delegate type.

The below example program in C#, demonstrates implementing a multi cast delegate and a custom event in C#.

using System;


namespace ProgramCall



    //Declare delegate outside the class

    public delegate void mydelegate(int x, int y);


    class MyClass


        //Declare a custom event

        public static event mydelegate myevent;


        public static void sum(int x, int y)


            Console.WriteLine("Sum " + (x + y));



        public static void diff(int x, int y)


            Console.WriteLine("Diff " + (x - y));



        //Raising event

        public static void RaiseEvent(int x, int y)


            if (myevent != null)


                myevent(x, y);







    class MainClass


        static void Main(string[] args)



            //Instantiate delegate by passing a method name

            mydelegate del = new mydelegate(MyClass.sum);


            //attaching a method to delegate

            del += MyClass.diff;


            //As the above delegate holds reference of 2 methods ,

            //it is called as multicast delegate


            //calling a delegate

            del(10, 8);


            // alternate way to invoke a delegate

            del.Invoke(10, 10);


            //attaching a delegate to event

            MyClass.myevent += del;


            MyClass.RaiseEvent(10, 6);






Sum 18
Diff 2

Sum 20
Diff 0

Sum 16
Diff 4

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Exmaple program for Delegates and Events, Raising Events in C# , MultiCast Delegate example progarm in C#.NET, Raising Custom Events in .NET, declaring custom events in C#