find null value dynamic textbox

Question

 please solve my problem

 

first i create text box...

 

protected void ddsize_SelectedIndexChanged(object sender, EventArgs e)

{

if (counter > 1)

return;

foreach (ListItem item in ddsize.Items)

{

if (item.Selected)

{

Panel1.Visible = true;

TextBox txtprice = new TextBox();

txtprice.ID = "txt_price" + item.Value;

txtprice.Width = 30;

Label lbl = new Label();

lbl.Text = item.Text;

Panel1.Controls.Add(lbl);

Panel1.Controls.Add(txtprice);

}

}

counter++;

 

 

 

 

 

and then find that id in another forachloop...code is

 

 

foreach (ListItem item in ddsize.Items)

{

if (item.Selected)

{

TextBox text = (TextBox)Panel1.FindControl("txt_price" + item.Value);

}

}