Nested events in C# | Delegate calling another Delegate Sample

Program

using System;

using System.Threading;

namespace DelegatesAndEvents

{

    class EventExample02

    {

        delegate void MyDelFillorDrain();

        event MyDelFillorDrain MyEvent;

        public void FillTheTank()

        {

            Console.WriteLine("Water Level increasing");

            for(int i=1000;i<=5000;i=i+1000)

            {

                Console.WriteLine(i + " Litres");

                Thread.Sleep(500);

                if (i == 5000)

                {

                    this.MyEvent = new MyDelFillorDrain(DrainTheTank);

                    Console.WriteLine("Open valve to distribute");

                }

            }

        }

        public void DrainTheTank()

        {

            Console.WriteLine("Water Level decreasing");

            for (int i = 5000; i >= 0; i = i - 1000)

            {

                Console.WriteLine(i + " Litres");

                Thread.Sleep(500);

                if(i==0)

                {

                    this.MyEvent = new MyDelFillorDrain(FillTheTank);

                    Console.WriteLine("Start motor to fill water");

                }

            }

        }

        static void Main(string[] args)

        {

            Console.WriteLine("Water tank model");

           

            EventExample02 obj1 = new EventExample02();

            obj1.MyEvent = new MyDelFillorDrain(obj1.FillTheTank);

            int Operations = 0;

            while (Operations < 4)

            {

                Operations++;

                obj1.MyEvent();

            }

            Console.ReadKey();

        }

    }

}

Output

Water tank model

Water Level increasing

1000 Litres

2000 Litres

3000 Litres

4000 Litres

5000 Litres

Open valve to distribute

Water Level decreasing

5000 Litres

4000 Litres

3000 Litres

2000 Litres

1000 Litres

0Litres

Start motor to fill water

Water Level increasing

1000 Litres

2000 Litres

3000 Litres

4000 Litres

5000 Litres

Open valve to distribute

Water Level decreasing

5000 Litres

4000 Litres

3000 Litres

2000 Litres

1000 Litres

0Litres

Start motor to fill water