public Form1()
        {
            InitializeComponent();
            this.InitializeTelephony();
        }

        private void InitializeTelephony()
        {

            m_telephony = new Telephony();//我定义Telephony m_telephony 也不对，貌似Telephony是 namespace 的吧？

            //Initialize the telephony class
            m_telephony.Initialize();

            //Get the cellular line with Monitor and Owner privileges
            m_line = m_telephony.CellularLine(MediaMode.InteractiveVoice, CallPrivilege.Monitor | CallPrivilege.Owner);

            //Add a new call event
            m_line.NewCall += new Line.NewCallHandler(m_line_NewCall);
        }