Detect Autoscrollposition value change in panel

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:

1. ListBox1
2. ListBox2
3. Panel
4. 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.