how to acess runtime created textbox from panel control

[sagardeshmukh310]

using System;
using System.Data;
using System.Configur ation;
using System.Web;
using System.Web.Secu rity;
using System.Web.UI;
using System.Web.UI.W ebControls;
using System.Web.UI.W ebControls.WebP arts;
using System.Web.UI.H tmlControls;

public partial class _Default : System.Web.UI.P age
{


protected void Page_Load(objec t sender, EventArgs e)
{



}


protected void ButtonMain_Clic k(object sender, EventArgs e)
{

int i, x;

x =Convert.ToInt3 2(TextBoxMain.T ext);



for (i = 0; i <x; i++)
{


TextBox txt = new TextBox();
txt.Width = 100;
txt.ID = "txt"+i;
TextBox txtb = new TextBox();
txtb.Width = 100;
txtb.ID="txtb"+ i;
DropDownList ddl = new DropDownList();
ddl.Width=150;
ddl.Items.Add(" KIOSKS Machine");
ddl.Items.Add(" ATM Machines");
ddl.Items.Add(" TIME N TRACK Machine");
ddl.ID = "ddl"+ i;
Button btn = new Button();
btn.Width = 70;
btn.Text = "UPDATE";
btn.ID = "btn" + i;
Button btnn = new Button();
btnn.Width = 70;
btnn.Text = "DELETE";
btnn.ID = "btnn" + i;


Panel1.Controls .Add(txt);
Panel1.Controls .Add(txtb);
Panel1.Controls .Add(ddl);
Panel1.Controls .Add(btn);
Panel1.Controls .Add(btnn);




}



}
protected void TextBoxMain_Tex tChanged(object sender, EventArgs e)
{

}

protected void ButtonUpdate_Cl ick(object sender, EventArgs e)
{

}
protected void ButtonDelete_Cl ick(object sender, EventArgs e)
{

Panel1.Controls[0].FindControl("t xt");
Panel1.Controls[0].FindControl("t xtb"); *************** **********







}
}




Now upto * marked line my code is running but now for deletion the text in textbox created at runtime i want code how to separate textbox from panal control i.e i want code after line of * mark......

PLZ HELP ME...