How to get value from dynamic created Textbox using Params in C#

Hi friend .
  If we create dynamic Textbox in Asp.Net and Add it on the Place Holder like this,


public partial class _Default : System.Web.UI.Page
{
    string txtId;
    TextBox txt = new TextBox();
    protected void Page_Load(object sender, EventArgs e)
    {
       
        txt.ID = "txt";
        PlaceHolder1.Controls.Add(txt);
        txtId = txt.UniqueID; // this will give u Unique ID like this "ctl00$ContentPlaceHolder1$txt"
        
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Label1.Text = Request.Params[txtId].ToString();
        
    }
}

Hope this will help you.
Rajesh