how can we find all textbox control in one function

public partial class _Default : System.Web.UI.Page
   {
      
       public List<TextBox> ListOfTextBoxes = new List<TextBox>();
       protected void Page_Load(object sender, EventArgs e)
       {
           // after execution this line
           FindTextBoxes(Page, ListOfTextBoxes);
           //ListOfTextBoxes will be populated with all text boxes with in the page.

       }


       private void FindTextBoxes(Control Parent, List<TextBox> ListOfTextBoxes)
       {
           foreach (Control c in Parent.Controls) {
               // if c is a parent control like panel
               if (c.HasControls())
               {
                   // search all control inside the panel
                   FindTextBoxes(c, ListOfTextBoxes);
               }
               else {
                   if (c is TextBox)
                   {
                       // if c is type of textbox then put it into the list
                       ListOfTextBoxes.Add(c as TextBox);
                   }
               }
           }
       }
   }