一个计数器类

    public class Counter
    {
        private static UInt32 _counter = 0;
        public static UInt32 Next
        {
            get
            {
                if (_counter == 99999999) { _counter = 0; }
                _counter++;
                string _prenum = DateTime.Now.ToString("dd");
                string ret = _prenum + _counter.ToString("00000000");
                return Convert.ToUInt32(ret);
            }
        }
        public static void Reset()
        {
            _counter = 0;
        }
    }