public virtual bool WaitOne (TimeSpan timeout, bool exitContext)
        {
            long tm = (long)timeout.TotalMilliseconds;
            if (-1 > tm || (long) Int32.MaxValue < tm)
            {
                throw new ArgumentOutOfRangeException("timeout",
                Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegOrNegative1"));
            }
            return WaitOne(tm,exitContext);
        }