How to find the controls recursively in a Form/Control

private IList controlsList = new List();

public IEnumerable GetControlsRecursively(Control container)
{
            controlsList.Clear();
            FindControlsRecursively(container);

            return ControlsList;
}

private void FindControlsRecursively(Control container)
{
        foreach (Control control in container.Controls)
        {
                controlsList.Add(control);
                if (container.HasChildren)
                    FindControlsRecursively(control);
        }
}