public SynchronizeErrorEventArgs(SynchronizeException ex)
        {
            if (ex == null)
                throw new ArgumentNullException("ex");

            _ex = ex;
        }
        public SynchronizeErrorEventArgs(SynchronizeException ex)
        {
            if (ex == null)
            {
                throw new ArgumentNullException("ex");
            }

            _ex = ex;
        }