public frmSelectGuestForAppointment(AppointmentGuestViewModel agvm, IAppointmentManager apptMrg)
{
_agvm = agvm;
_apptMrg = apptMrg;
try
{
_guestViewModels = _apptMrg.RetrieveGuestList();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
InitializeComponent();
}