using System;

namespace EventsExample {

    // Create a delegate
    public delegate void NameFoundEventHandler( object o, NameFoundEventArgs e );

    // Define the Event Arguments (EventArgs) in an inherited class
    public class NameFoundEventArgs : EventArgs {

        public string Name;

        public NameFoundEventArgs ( string name ) {

            this.Name = name;
        }
    }

    // Define a "program" class to simulate an event listener
    public class Program {

        // Create the event
        public static event NameFoundEventHandler NameFound;

        public static void Main () {

            // Register a "to be initiated method" with the event
            NameFound += new NameFoundEventHandler( sayHelloWorld );

            // Create an array to store 10 first and surnames
            string[] names = new string[10];

            names[0] = "Tom Wadeson";
            names[1] = "Andy Smith";
            names[2] = "Ben Rogers";
            names[3] = "Tom Saunders";
            names[4] = "Billy Piper";
            names[5] = "Sandy Leon";
            names[6] = "Chris Stevenson";
            names[7] = "Brad Friedal";
            names[8] = "Tom Curtis";
            names[9] = "Rich McGill";

            Console.WriteLine( "Only people named \"Tom\" may speak:" );

            // Iterate through the array, and initiate the NameFound event for all occurrences of "Tom"
            foreach( string name in names ) {

                if ( name.StartsWith( "Tom" ) ) {

                    NameFoundEventArgs e1 = new NameFoundEventArgs( name );
                    onNameFound( e1 );
                }
            }

            Console.Read();
        }

        // Create the "onEvent" method
        public static void onNameFound ( NameFoundEventArgs e ) {

            if ( NameFound != null ) {

                NameFound( new object(), e );
            }
        }

        // Create the "initiated method" - the code to be executed upon occurrence of an event
        public static void sayHelloWorld ( object o, NameFoundEventArgs e ) {

            Console.WriteLine( "Hello, World! From {0}.", e.Name );
        }
    }    
}