How to traverse all the controls on a specified page under ASP.net

#region empty all control contents on the specified page, the public static void Clearallcontent ()//////clears all control contents on the specified page, including Textbox,checkbox,checkboxlist,ra 
Diobutton,radiobuttonlist. But not clear///in addition to such as listbox,dropdownlist, because such a control value for the current page can also be used, generally these controls are saved dictionary data. 
    Author:kevin///Date: 2004-12-02//////specified page public static void Clearallcontent (System.Web.UI.Control page) { int npagecontrols = page.
    Controls.Count;
    for (int i = 0;
    i < Npagecontrols; i++) {foreach (System.Web.UI.Control control in page). Controls[i]. Controls) {if (control).
            Hascontrols ()) {Clearalltext (control); else {if (Control's TextBox) (Control as TextBox).
                
                Text = ""; if (control's CheckBox) (Control as CheckBox).
                
                Checked = false; If (Control are RadioButtonList) (control as RadioButtonList).
                
  SelectedIndex =-1;              If (Control are RadioButton) (control as RadioButton).
                
                Checked = false;  If (control are CheckBoxList) {foreach (ListItem item in (Control as CheckBoxList) ). Items) {Item.
                    Selected = false; The}}}}} #endregi