序列号生成代码

代码说明：

        public static string DesEncrypt(string encryptString, string key)         {             byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 8));             byte[] keyIV = keyBytes;             byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);             DESCryptoServiceProvider provider = new DESCryptoServiceProvider();             MemoryStream mStream = new MemoryStream();             CryptoStream cStream = new CryptoStream(mStream, provider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);  &nb