//生成订单号    public string GetOrderNO()    {        StringBuilder result = new StringBuilder();        DateTime now = DateTime.Now;        result.Append(now.Year.ToString().Substring(2, 2));        string month = now.Month.ToString();        result.Append(month.Length < 2 ? "0" + month : month);        string day = now.Day.ToString();        result.Append(day.Length < 2 ? "0" + day : day);        String hour = now.Hour.ToString();        result.Append(hour.Length < 2 ? "0" + hour : hour);        string minute = now.Minute.ToString();        result.Append(minute.Length < 2 ? "0" + minute : minute);        string second = now.Second.ToString();        result.Append(second.Length < 2 ? "0" + second : second);        int last = new Random().Next(10000);        result = result.Append(last.ToString());        if (last > 99 && last <= 999)        {            result = result.Append("0");        }        else if (last > 9 && last <= 99)        {            result = result.Append("00");        }        else if (last <= 9)        {            result = result.Append("000");        }        else        {        }        return result.ToString();    }