生成随机数

    /// <summary>
    /// 生成随机数
    /// </summary>
    /// <returns></returns>
    protected string getRandomValue()
    {
        StringBuilder strBld = new StringBuilder();
        strBld.Append("SN");
        strBld.Append(DateTime.Now.ToString("yyyyMMddHHmmss"));
        char[] strRandom = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
                            'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
        Random random = new Random();
        strBld.Append(strRandom[random.Next(30)].ToString() + strRandom[random.Next(30)].ToString() + strRandom[random.Next(30)].ToString());
        return strBld.ToString();
    }