public static void WriteBizLog(BizObject bo)
 {
     log4net.ILog log = log4net.LogManager.GetLogger(typeof(BizObject));
     log.Info(bo);
 }
 public static void LogBizAsync(BizObject bo)
 {
     LogBizHandler handler = new LogBizHandler(WriteBizLog);
     handler.BeginInvoke(bo, LogBizCallBack, handler);
 }