Delegates and their role in Events in C# .NET

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace DelegateIssue
{
    public partial class Form1 : Form
    {
        MyData _data;
        Consumer _consumer1, _consumer2;
        public Form1()
        {
            InitializeComponent();
            _data = new MyData();
            _consumer1 = new Consumer(_data,"Consumer1");
            _consumer2 = new Consumer(_data,"Consumer2");            
        }

        private void operateButton_Click(object sender, EventArgs e)
        {
            if(_data.Operate!= null)
            _data.Operate();
        }

        

        private void wire1Button_Click(object sender, EventArgs e)
        {
            issueTextBox.Text = "";
            _consumer1.WireDelegate();
            consumer1TextBox.Text = "Consumer1 is wired for " + _consumer1.WiringCount + " time(s)";            
        }

        private void wireButton2_Click(object sender, EventArgs e)
        {
            issueTextBox.Text = "";
            _consumer2.WireDelegate();
            consumer2TextBox.Text = "Consumer2 is wired for " + _consumer2.WiringCount + " time(s)";           
        }

        private void unwire1Button_Click(object sender, EventArgs e)
        {
            _consumer1.UnWireDelegate();
            consumer1TextBox.Text = "Consumer1 is wired for " + _consumer1.WiringCount + " time(s)";           
        }

        private void unwire2Button_Click(object sender, EventArgs e)
        {
            _consumer2.UnWireDelegate();
            consumer2TextBox.Text = "Consumer2 is wired for " + _consumer2.WiringCount + " time(s)";            
        }


        private void reset1Button_Click(object sender, EventArgs e)
        {
            _consumer1.ResetDelegateToNull();
            issueTextBox.Text = "Resetting Consumer1 wiring will reset the wiring of Consumer2 having wiring" + _consumer2.WiringCount + " time(s)";
            //_consumer2.ResetWiringCount(); reset the wiring count to zero. As consumer1 has set the Opearate delegate to null, that will indirectly set consumer2 Operate to null
        }
        private void reset2Button_Click(object sender, EventArgs e)
        {
            _consumer2.ResetDelegateToNull();
            issueTextBox.Text = "Resetting Consumer2 wiring will reset the wiring of Consumer1 having wiring" + _consumer1.WiringCount + " time(s)";
            //_consumer2.ResetWiringCount();
        }
      
    }

    //Delegate defination
    //It is exactly similar to declaring a signature of method.
    //You need to use delegate as suffix to signature
    //OperationDelegate is the Name of delegate
    public delegate void OperationDelegate();

    public class MyData
    {
        public int Value1 { get; set; }
        public int Value2 { get; set; }
        public OperationDelegate Operate { get; set; }
    }


    public class Consumer
    {
        private MyData _data;
        private string _name;
        private int _wiringCount;
        public int WiringCount
        {
            get
            {
                return _wiringCount;
            }
        }
        public Consumer(MyData data,string name)
        {
            _data = data;
            _name = name;
        }
        private void Operation()
        {
            MessageBox.Show("Operation method of instance "+_name+" is excuted.");
        }
        public void ResetDelegateToNull()
        {
            _wiringCount = 0;
            _data.Operate = null;
        }
        public void WireDelegate()
        {
            _wiringCount++;
            _data.Operate += this.Operation;
        }
        public void UnWireDelegate()
        {
            if (_wiringCount > 0)
            _wiringCount--;
            _data.Operate -= this.Operation;
        }

        public void ResetWiringCount()
        {
            _wiringCount = 0;
        }
    }
}