Form Changed Control

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

namespace Form_Change_Control_Test_CSharp
{
    public partial class Form_Changetest : Form
    {
        public Form_Changetest()
        {
            InitializeComponent();

            this.Button_Reset.Click += new EventHandler(Button_Reset_Click);
            this.Button_WhatChanged.Click += new EventHandler(Button_WhatChanged_Click);

            this.formChangedComponent1.MonitoredControlChanged += new FormChangedComponent.MonitoredControlChangedEventHandler(formChangedComponent1_MonitoredControlChanged); 

        }

        void formChangedComponent1_MonitoredControlChanged(object sender, FormChangedEventArgs e)
        {
            if (e.ControlChanged is TextBox)
            {
                if (e.Changed)
                {
                    e.ControlChanged.BackColor = Color.Yellow; 
                }
                else 
                {
                    e.ControlChanged.BackColor = Color.White;
                }
            }
        }


        void Button_WhatChanged_Click(object sender, EventArgs e)
        {
            System.Text.StringBuilder _ctlsOut = new StringBuilder();
            foreach (Control  ctl in this.formChangedComponent1.ControlsThatHaveChanged  )
            {
                _ctlsOut.AppendLine(ctl.Name); 
            }
            System.Windows.Forms.MessageBox.Show(_ctlsOut.ToString(), @"Controls that have changed");  
        }

        void Button_Reset_Click(object sender, EventArgs e)
        {
            this.formChangedComponent1.ResetDirtyFlags();
        }


    }
}