public void Doit (object toObj)
>        {
>            Timer t = toObj as Timer;
>            if (t != null)
>            {
>                if (t.Enabled && t.Interval > 0)
>                {
>                    t.Enabled = false;
>                    t.Interval = 0;
>                }
>            }
>        }

I'd do a bit more type checking in the first one if it was for production - but even as it stands it is safer than the VFP version....

I like the AS operator

You don't have to cast