How to reset ALL the controls in a form to the default values

public void ResetControls(Control parentControl)
{
            foreach (Control control in parentControl.Controls)
            {
                if (control is TextBox)
                    (control as TextBox).Text = String.Empty;

                if (control is CheckBox)
                    (control as CheckBox).Checked = false;

                if (control is ComboBox)
                    (control as ComboBox).SelectedIndex = -1;
                // Do same for controls having children
                if (control.HasChildren)
                    ResetControls(control);
            }
}