public static void ReadLog()
        {
        // creat event watcher    
     
            FileSystemWatcher watcher = new FileSystemWatcher();
            watcher.Path = logpath;
            watcher.NotifyFilter = NotifyFilters.LastWrite; 
           NotifyFilters.FileName;         
            // Add event handlers.
            watcher.Changed += new FileSystemEventHandler(OnChanged);
       
            // Begin watching.
            watcher.EnableRaisingEvents = true;
         
            //infinite loop
            while(true)
            {
               BFS.VoiceBotActions.Delay(1);
            }
        }