/// <summary>
 /// ��Ļ�����¼�
 /// </summary>
 /// <param name="num">��Ļ������Ŀ</param>
 private void ScreenSplite(int num)
 {
     if (null != ScreenEvent)
     {
         ScreenEventArgs args = new ScreenEventArgs();
         args.ChannelNum = num;
         ScreenEvent(this, args);
     }
 }
 //�����и�
 private void watchpanel_ScreenEvent(object sender, ScreenEventArgs e)
 {
     if (WatchViedoPanel.ChannelNum != e.ChannelNum)
         WatchViedoPanel.ChannelNum = e.ChannelNum;
 }