public static List <Appointment> GetParticipantsAppointments(List <User> selectedUsers, AppointmentDatabase appointmentDatabase)
{
List <Appointment> selectedUsersAppointments = new List <Appointment>();
if (selectedUsers != null && appointmentDatabase != null)
{
foreach (User user in selectedUsers)
{
selectedUsersAppointments.AddRange(appointmentDatabase.GetSelectedUserAppointments(user));
}
}
return(selectedUsersAppointments);
}