C#判断是否连网

 Ping p =new Ping();
            PingReply pr;
            pr = p.Send("119.75.218.45");//百度的IP 
            if(pr.Status != IPStatus.Success)//如果连接不成功 
            {
                Console.WriteLine("未联网");
            }
            else
            {
                Console.WriteLine("已联网");
  
            }
            Console.Read();