i use these code in asp.net it will work correctly but this cannot find the conrols in dnn page..

foreach (Control c in Panel1.Controls)
{
if (c.Controls.Count > 0)
{
foreach (Control c2 in c.Controls)
{
if (c2.GetType().ToString() == "System.Web.UI.WebControls.TextBox")
{
TextBox rb = (TextBox)c2;

Button1.Text = "Success";
args.IsValid = true;


}
}
}