public void Save(int seminar_id, List <int> attendees)
{
var elements = (from a in context.Attendees where a.SeminarID == seminar_id select a);
context.RemoveRange(elements);
foreach (int person_id in attendees)
{
var a = new Attendee()
{
SeminarID = seminar_id, PersonID = person_id
};
context.Attendees.Add(a);
}
context.SaveChanges();
}
