How to find all instances of a particular control type in asp.net page

Generically walking the control tree and returning a List<TextBox> for example. Usage: protected void Button1_Click(object sender, EventArgs e) { List<TextBox> list= Util.FindControl<TextBox>(this.Controls); foreach (var t in list) this.divStuff.InnerText += t.ID + ": "; }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Findcontrols
{
    public class Util
    {
        public static List<T> FindControl<T>(System.Web.UI.ControlCollection Controls) where T : class
        {
           List<T> list = new List<T>();
            T found = default(T);

             if (Controls != null && Controls.Count > 0)
             {
                 for (int i = 0; i < Controls.Count; i++)
                 {
                     if (Controls[i] is T)
                    {
                        found = Controls[i] as T;
                         list.Add(found);
                         break;
                     }
                      else
                     {
                          var k= FindControl<T>(Controls[i].Controls);
                         list.AddRange(k);
                     }
                 }
            }
            return list;
        }
   }
}