Listbox problem

[L.Peter]

Dear Group,
I am doing Drag and Drop function and see this problem
if I select 3 from listBox1 and drag to listBox2, the value in listBox1 is
not updated, even I move (or use up and down keyboard) to select number 4,
the selectedItem.ToString() still shows 3
Am i doing something wrong?

Here is the file
****
using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

namespace Controls

{

/// <summary>

/// Summary description for Dragdrop.

/// </summary>

public class Dragdrop : System.Windows.Forms.Form

{

private System.Windows.Forms.ListBox listBox2;

private System.Windows.Forms.TextBox textBox1;

private System.Windows.Forms.TextBox textBox2;

private System.Windows.Forms.ListBox listBox1;

/// <summary>

/// Required designer variable.

/// </summary>

private System.ComponentModel.Container components = null;

public Dragdrop()

{

//

// Required for Windows Form Designer support

//

InitializeComponent();

//

// TODO: Add any constructor code after InitializeComponent call

//

}

/// <summary>

/// Clean up any resources being used.

/// </summary>

protected override void Dispose( bool disposing )

{

if( disposing )

{

if(components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}

#region Windows Form Designer generated code

/// <summary>

/// Required method for Designer support - do not modify

/// the contents of this method with the code editor.

/// </summary>

private void InitializeComponent()

{

this.listBox2 = new System.Windows.Forms.ListBox();

this.textBox1 = new System.Windows.Forms.TextBox();

this.textBox2 = new System.Windows.Forms.TextBox();

this.listBox1 = new System.Windows.Forms.ListBox();

this.SuspendLayout();

//

// listBox2

//

this.listBox2.AllowDrop = true;

this.listBox2.Location = new System.Drawing.Point(232, 32);

this.listBox2.Name = "listBox2";

this.listBox2.Size = new System.Drawing.Size(112, 160);

this.listBox2.TabIndex = 1;

this.listBox2.DragDrop += new
System.Windows.Forms.DragEventHandler(this.listBox 2_DragDrop);

this.listBox2.DragEnter += new
System.Windows.Forms.DragEventHandler(this.listBox 2_DragEnter);

this.listBox2.SelectedIndexChanged += new
System.EventHandler(this.listBox2_SelectedIndexCha nged);

//

// textBox1

//

this.textBox1.Location = new System.Drawing.Point(136, 56);

this.textBox1.Name = "textBox1";

this.textBox1.Size = new System.Drawing.Size(72, 20);

this.textBox1.TabIndex = 2;

this.textBox1.Text = "textBox1";

//

// textBox2

//

this.textBox2.Location = new System.Drawing.Point(136, 88);

this.textBox2.Name = "textBox2";

this.textBox2.Size = new System.Drawing.Size(72, 20);

this.textBox2.TabIndex = 3;

this.textBox2.Text = "textBox2";

//

// listBox1

//

this.listBox1.Location = new System.Drawing.Point(8, 40);

this.listBox1.Name = "listBox1";

this.listBox1.Size = new System.Drawing.Size(120, 134);

this.listBox1.TabIndex = 4;

this.listBox1.MouseDown+=new MouseEventHandler(listBox1_MouseDown);

this.listBox1.SelectedIndexChanged +=new
EventHandler(listBox1_SelectedIndexChanged);

//

// Dragdrop

//

this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);

this.ClientSize = new System.Drawing.Size(368, 214);

this.Controls.Add(this.listBox1);

this.Controls.Add(this.textBox2);

this.Controls.Add(this.textBox1);

this.Controls.Add(this.listBox2);

this.Name = "Dragdrop";

this.Text = "Dragdrop";

this.Load += new System.EventHandler(this.Dragdrop_Load);

this.ResumeLayout(false);

}

#endregion

private void listBox2_SelectedIndexChanged(object sender, System.EventArgs
e)

{
}

private void listBox2_DragEnter(object sender, DragEventArgs e)

{

if (e.Data.GetDataPresent(typeof(string)))

{e.Effect=DragDropEffects.Move ; }

else

{e.Effect=DragDropEffects.None;}

}

private void listBox2_DragDrop(object sender,DragEventArgs e)

{

listBox2.Items.Add((string)e.Data.GetData(typeof(s tring)));

}

private void Dragdrop_Load(object sender, System.EventArgs e)

{

this.listBox1.Items.Add("1");

this.listBox1.Items.Add("2");

this.listBox1.Items.Add("3");

this.listBox1.Items.Add("4");

}

private void listBox1_MouseDown(object sender,MouseEventArgs e)

{

try

{
textBox1.Text = listBox1.SelectedIndex.ToString();

textBox2.Text=listBox1.Items[listBox1.SelectedIndex].ToString();

DragDropEffects effect =
listBox1.DoDragDrop(listBox1.Items[listBox1.SelectedIndex].ToString(),DragDr
opEffects.Move);

if (effect ==DragDropEffects.Move)

{

listBox1.Items.RemoveAt(listBox1.SelectedIndex);

}

}

catch{};

}

private void listBox1_SelectedIndexChanged(object sender, System.EventArgs
e)

{

textBox1.Text = listBox1.SelectedItem.ToString();

}

//private void DoDragDrop(string

}

}

***

TIA

L.Peter