Events

An event is a mechanism to notify all clients of the class about something happened, and clients executed the required operation on triggering of the event.

An event is a variable of type of a delegate with keyword 'event'.

Steps to create & use events:

1. Create a delegate
2. Create an event in your class (for that you want event tracking)
3. Call event
4. Hookup event with delegate

Example

    public class MyEventClass

    {

        public delegate void Mydelegate(object sender, MyEventArgsClass e); //step 1

        public event Mydelegate myEvent; //step 2

        public class MyEventArgsClass : EventArgs

        {

            public readonly string _message;

            public MyEventArgsClass(string message)

            {

                this._message = message;

            }

        }

        public void RaiseEvent(string message)

        {

            if(myEvent != null)

                myEvent(this, new MyEventArgsClass(message));  //step 3

        }

    }

    class Program

    {

       public static void Main(string[] args)

       {

        MyEventClass objEventClass = new MyEventClass();

        objEventClass.myEvent += objEventClass_myEvent;  //Step 4

       }

        //Client Method to Execute on Event

       static void objEventClass_myEvent(object sender, MyEventClass.MyEventArgsClass e)

       {

           if (sender is MyEventClass)

           {

               MyEventClass objClass = (MyEventClass)sender;

               Console.WriteLine("This is message : " + e._message);

           }

       }

    }