/// <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();
}