I should also note that i do a

private void _monthView_MouseDown(object sender, MouseEventArgs e)
        {
            if (this._monthView.GetAppointmentFromPoint(e.X, e.Y) != null)
            {
                _selectedAppointment = this._monthView.GetAppointmentFromPoint(e.X, e.Y);
                _selectedAppointment.Selected = true;
            }
            else
                _selectedAppointment = null;
        }

 on the mousedown event to select the appointment so i know what changed.

 Hello jisleyjr,

Well i m also facing the same prob but ur solution is not appropriate in my scenario, that is, when user double click on any apt than i m showing appointment dialog, and also i want the drag n drop events. Now in ur solution how whould i come to know that user has either drag the apt or just double click on it to open the dialog....??

Please help me..

Thank You 

Hello,

 Well i got the solution of the problem.....as we dont have the events of beforeAppointmentMoved & afterAppointmentMoved.....but we can achieve this functionality by using two of events mouseDown & mouseUp....sample code is as follow:

 private void ultraWeekView1_MouseDown(object sender, MouseEventArgs e)
     {
            if (this.ultraCalendarInfo1 != null && this.ultraCalendarInfo1.SelectedAppointments != null &&
                this.ultraCalendarInfo1.SelectedAppointments.Count > 0)
            {
                this.day = this.ultraWeekView1.GetDayFromPoint(e.Location);
                this.startTime = this.ultraCalendarInfo1.SelectedAppointments[0].StartDateTime;
                this.endTime = this.ultraCalendarInfo1.SelectedAppointments[0].EndDateTime;
            }
        }

        private void ultraWeekView1_MouseUp(object sender, MouseEventArgs e)
        {
            if (this.day != null)
            {
                if (this.day.Date != this.ultraWeekView1.GetDayFromPoint(e.Location).Date && this.ultraCalendarInfo1.SelectedAppointments.Count > 0)
                {
                    if (this.ultraCalendarInfo1.SelectedAppointments[0].StartDateTime < DateTime.Now)
                    {
                        this.ultraCalendarInfo1.SelectedAppointments[0].StartDateTime = this.startTime;
                        this.ultraCalendarInfo1.SelectedAppointments[0].EndDateTime = this.endTime;
                        MessageBox.Show("Cannot create appt in past");
                    }              
                }
            }         
        }

Thank You 

Hello there,

We are doing the same thing. Double click opens a dialog to edit if you click on an appointment, if there is a no appointment it opens the same dialog but we are not editting anything, just adding. 

else