public void Edit(Student student)
{
SetRelativeEntities(student);
db.Entry(student).State = EntityState.Modified;
db.SaveChanges();
}
public void Add(Student student)
{
SetRelativeEntities(student);
db.Students.Add(student);
db.SaveChanges();
}
private void SetRelativeEntities(Student student)
{
var group = db.Groups.Find(student.Group.id);
student.Group = group;
}