TcpServer.isListen C# (CSharp) Method

    public bool isListen()
    {
        return sock.Server.IsBound;
    }

 public void sendFrame()
 {
     while (ts.isListen())
     {
         RTPPlayer[] ps = rps.Values.ToArray();
         foreach (RTPPlayer r in ps)
         {
             r.sendFrame();
         }
         Thread.Sleep(20);
     }
 }