Detect Autoscrollposition value change in panel - visual-studio-2005

Question

How to detect if the Autoscrollposition value changes in the panel1?
For example,
textbox1 and textbox2.
which added in panel1. The autoscroll property is set to true.
I am only interested in detecting when the value of panel autoscrollposition changes.
The above for dynamic textboxes which are incremented.
Software in use: C#, Visual Studio 2005.

Answer 1

The Component required for it. is:
ListBox1
ListBox2
Panel
Button.
The Namespace for Class:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Collections;
Here is the Complete Solution Code:
namespace detectpanelvalue
{
public partial class Form1 : Form
{
private Point tbpoint = new Point(10, 14);
private Point tbbpoint = new Point(300, 14);
private ArrayList arylst;
private ArrayList arylst1;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
panel1.Paint += new PaintEventHandler(panel1_Paint);
}
void panel1_Paint(object sender, PaintEventArgs e)
{
System.Drawing.Point pnlpt;
pnlpt = panel1.AutoScrollPosition;
if (tbpoint !=null || pnlpt != null )
{
pnlpt = tbpoint;
}
arylst1 = new ArrayList();
arylst1.Add(pnlpt);
}
private void runtime()
{
foreach (Point pt in arylst)
{
listBox1.Items.Add(pt);
}
foreach (Point ptt in arylst1)
{
listBox2.Items.Add(ptt);
}
}
private void button1_Click(object sender, EventArgs e)
{
TextBox tb = new TextBox();
tb.Location = tbpoint;
this.panel1.Controls.Add(tb);
tbpoint.Y += 30;
TextBox bb = new TextBox();
bb.Location = tbbpoint;
this.panel1.Controls.Add(bb);
tbbpoint.Y += 30;
arylst = new ArrayList();
arylst.Add(tbpoint);
runtime();
}
}
}
It is helpful for adjust the panel autoscrollposition.