C#操作ADSL断开和重连

/// <summary>
        /// 宽带连接，成功返回true,失败返回 false
        /// </summary>
        /// <param name="PPPOEname">宽带连接名称</param>
        /// <param name="username">宽带账号</param>
        /// <param name="password">宽带密码</param>
        /// <returns></returns>
        public static bool Connect(string PPPOEname, string username, string password, ref string msg)
        {
            try
            {
                CreateOrUpdatePPPOE(PPPOEname);
                using (RasDialer dialer = new RasDialer())
                {
                    dialer.EntryName = PPPOEname;
                    dialer.AllowUseStoredCredentials = true;
                    dialer.Timeout = 1000;
                    dialer.PhoneBookPath = RasPhoneBook.GetPhoneBookPath(RasPhoneBookType.AllUsers);
                    dialer.Credentials = new NetworkCredential(username, password);
                    dialer.Dial();
                    return true;
                }
            }
            catch (RasException re)
            {
                msg = re.ErrorCode + " " + re.Message;
                return false;
            }
        }
        /// <summary>
        /// 创建或更新一个PPPOE连接(指定PPPOE名称)
        /// </summary>
        public static void CreateOrUpdatePPPOE(string updatePPPOEname)
        {
            RasDialer dialer = new RasDialer();
            RasPhoneBook allUsersPhoneBook = new RasPhoneBook();
            string path = RasPhoneBook.GetPhoneBookPath(RasPhoneBookType.AllUsers);
            allUsersPhoneBook.Open(path);
            // 如果已经该名称的PPPOE已经存在，则更新这个PPPOE服务器地址
            if (allUsersPhoneBook.Entries.Contains(updatePPPOEname))
            {
                allUsersPhoneBook.Entries[updatePPPOEname].PhoneNumber = " ";
                // 不管当前PPPOE是否连接，服务器地址的更新总能成功，如果正在连接，则需要PPPOE重启后才能起作用
                allUsersPhoneBook.Entries[updatePPPOEname].Update();
            }
            // 创建一个新PPPOE
            else
            {
                string adds = string.Empty;
                ReadOnlyCollection<RasDevice> readOnlyCollection = RasDevice.GetDevices();
                //                foreach (var col in readOnlyCollection)
                //                {
                //                    adds += col.Name + ":" + col.DeviceType.ToString() + "|||";
                //                }
                //                _log.Info("Devices are : " + adds);
                // Find the device that will be used to dial the connection.
                RasDevice device = RasDevice.GetDevices().Where(o => o.DeviceType == RasDeviceType.PPPoE).First();
                RasEntry entry = RasEntry.CreateBroadbandEntry(updatePPPOEname, device);    //建立宽带连接Entry
                entry.PhoneNumber = " ";
                allUsersPhoneBook.Entries.Add(entry);
            }
        }

        /// <summary>
        /// 断开 宽带连接
        /// </summary>
        public static void Disconnect()
        {
            ReadOnlyCollection<RasConnection> conList = RasConnection.GetActiveConnections();
            foreach (RasConnection con in conList)
            {
                con.HangUp();
            }
        }