PLZ RESOLVE THIS EXCEPTION ITS URGENT

store following value in LABEL 
lbl.Text+= txt.ID

Hi akash singh,

Use likes this in button click

protected void Button1_Click(object sender, EventArgs e)

        {          

           

            for (int i = 0; i < ListBox2.GetSelectedIndices().Count();i++ )

            {

 

               

                if ((TextBox)Panle1.FindControl("txt"+ListBox2.SelectedIndex) != null)

                {

                    TextBox txt = (TextBox)Panle1.FindControl("txt" + ListBox2.SelectedIndex);

                    Response.Write("TextBox ID = " + txt.ID + "
");

                    Response.Write("TextBox Text = " + txt.Text + "
");                   

                }

                else

                    Response.Write("Nothing is there");

 

            }

 

And create a method

void AddControl()

        {

            if (ListBox2.SelectedIndex != -1)

            {

                Table tbl = new Table();

                tbl.ID = "Tabl";

                tbl.EnableViewState = true;

                tbl.ViewStateMode = ViewStateMode.Enabled;

                // tbl.Attributes.Add("runat", "server");

 

                for (int i = 0; i < ListBox2.Items.Count; i++)

                {

                    //TableRow tr = new TableRow();

 

                    if (ListBox2.Items[i].Selected)

                    {

                        //++ind;

                        TableRow tr = new TableRow();

                        tr.EnableViewState = true;

                        tr.ViewStateMode = ViewStateMode.Enabled;

                        // tr.Attributes.Add("runat", "server");

                        TableCell col = new TableCell();

                        col.EnableViewState = true;

                        col.ViewStateMode = ViewStateMode.Enabled;

                        // col.Attributes.Add("runat", "server");

                        col.Width = 100;

                        Label Lbl = new Label();

                        Lbl.Text = ListBox2.Items[i].Text;

                        Lbl.ID = "lbl" + i.ToString();

                        Lbl.ForeColor = System.Drawing.Color.Red;

                        col.Controls.Add(Lbl);

                        // arr[ind] = Lbl.Text;                                

                        TableCell col1 = new TableCell();

                        TextBox txt = new TextBox();

                        txt.ID = "txt" + i.ToString();

                        txt.EnableViewState = true;

                        txt.ViewStateMode = ViewStateMode.Enabled;

                        // txt.ID = ListBox2.Items[i].Text;

                        txt.Width = 150;

                        txt.Height = 20;

                        col1.Controls.Add(txt);

                        tr.Cells.Add(col);

                        tr.Cells.Add(col1);

                        //Lbl1.Text = "txt" + i.ToString();

                        //  txt.TextChanged += new EventHandler(adddff);

                        //  LabCHK.Text += tr.Cells[2];

 

                        // tbl.Rows.Add(tr);

                        tbl.Rows.Add(tr);

 

 

                    }

 

 

                }

 

                Panle1.Controls.Add(tbl);

 

            }

        }

and call it in page lode in place of ListBox Selected Index change

protected void Page_Load(object sender, EventArgs e)

        {

            AddControl();

        }