Thanks for the Sample, but in my case i am trying to implement infragistic sample frmAppointmentDialog2007 on which Custom Appointment Dialog is opened. I am still not able to do one thing. Suppose there is an appointment then i click and open the occurance. now if i want to delete it i can use this code

if ( result == DialogResult.Yes )
                                {
                                    this.initialAppointment.IsRemoved = true;
                                    this.modified = false;
                                    this.Close();
                                }

this code is able to remove that occurance from the calendar but how can I update on this event ,dont i need to save this delete event somewhere. like below code can remove the appointment from the calendar

  if (this.OnAppointmentDeleted != null)
                       {
                           AppointmentDeletedEventArgs args = new AppointmentDeletedEventArgs(this.initialAppointment);
                            OnAppointmentDeleted(this, args);
                        }
                        if (this._CurrentCalendarInfo.Appointments.Contains(this.initialAppointment))
                        {
                            this._CurrentCalendarInfo.Appointments.Remove(this.initialAppointment);
                        }
                   this.IsModified = false;

i still could not understand how to remove that occurance from the Appointment. can you please clear my doubts thanks