private static extern int RasGetEntryDialParams(string lpszPhonebook, [In, Out] ref RasDialUC.RASDIALPARAMS lprasdialparams, out bool lpfPassword);
private static extern int RasDial(IntPtr lprasDialExtensions, string lpszPhoneBook, ref RasDialUC.RASDIALPARAMS lpRasDialParams, uint dwNotifierType, Delegate hwndNotifier, ref IntPtr lphRasConn);