How to disable all controls on the form except for a button?

Question

My form has hundreds of controls: menus, panels, splitters, labels, text boxes, you name it.

Is there a way to disable every control except for a single button?

Answer 1

I have corrected @coloboxp answer, first you must enable all parents:

    public static void Enable(this Control con, bool enable)
    {
        if (con != null)
        {
            if (enable)
            {
                Control original = con;

                List parents = new List();
                do
                {
                    parents.Add(con);

                    if (con.Parent != null)
                        con = con.Parent;
                } while (con.Parent != null && con.Parent.Enabled == false);

                if (con.Enabled == false)
                    parents.Add(con); // added last control without parent

                for (int x = parents.Count - 1; x >= 0; x--)
                {
                    parents[x].Enabled = enable;
                }

                con = original;
                parents = null;
            }

            foreach (Control c in con.Controls)
            {
                c.Enable(enable);
            }

            try
            {
                con.Invoke((MethodInvoker)(() => con.Enabled = enable));
            }
            catch
            {
            }
        }
    }