Clear all Textboxes on a Form or Group control

//On a Form

foreach(Control ctl in this.Controls)
       {
         if (ctl is TextBox)
            (ctl as TextBox).Text = "";
       }

 //On Group Control

foreach (Control ctrls in gcGeneralInfo.Controls)

            {

                if (ctrls is TextBox)

                    ctrls.Text = string.Empty;

            }