Issue while adding attendees to Office 365 using Microsoft.Exchange.WebServices

Hi:

I am working on windows c# application. I am creating new calendar entries on Office 365 by using Microsoft.Exchange.WebServices When I add any attendee to calendar item and save to office 365, invitation to attendee is sent automatically. I dont want to send meeting req to attendees and want only to add them. Is there any way to do that?

ObjAppointment.RequiredAttendees.Add(p_calendarProperties.invitees);

Thanks in advance