Speed.cs

public class Speed(){

public void Main(){
Example example=new Example();
example.SpeedValueChanged += delegate (int speed)
{
    Console.WriteLine("Speed changed: " + speed);
};

example.SpeedValueChanged += (int speed)=>
{
    if(speed > 70)
    {
        Console.WriteLine("You are too fast");
    }
};

example.Speed = 20;
example.Speed = 100;

}
}





public delegate int MyEventHandler();
    public delegate void SpeedValueChangedEventHandler(int value);
    public class Example
    {
        private int _speed;
        public int Speed
        {
            get
            {
                return this._speed;
            }
            set
            {
                SpeedValueChanged(value);
                _speed = value;
            } }