System.ComponentModel.DebugReflectPropertyDescriptor.AddValueChanged C# (CSharp) Method

        public override void AddValueChanged(object component, EventHandler handler) {
            if (component == null) throw new ArgumentNullException("component");
            if (handler == null) throw new ArgumentNullException("handler");
            
            EventInfo changedEvent = ChangedEventValue;
            if (changedEvent != null) {
                changedEvent.AddEventHandler(component, handler);
            }
            else {
                base.AddValueChanged(component, handler);
            }
        }