c# socket connect 连接超时问题。

sa.Blocking = false;
            for (int i = 0; i < 10; ++i)
            {
                try
                {
                    sa.Connect(ip, port);
                }
                catch
                { 
                }
                Thread.Sleep(100);
                if (sa.Connected)
                {
                    break;
                }
            }
          
            
            sa.Blocking = true;
            if (sa.Connected == false)
            {
                connIsok = false;
                return connIsok;
            }