public static extern int RasDial(int lpRasDialExtensions, string lpszPhonebook, ref DialClass.RASDIALPARAMS lprasdialparams, int dwNotifierType, int lpvNotifier, ref int lphRasConn);
public DialClass() { this.Connection = 0; this.RasDialParams = new DialClass.RASDIALPARAMS(); this.RasDialParams.dwSize = Marshal.SizeOf(this.RasDialParams); }