public void RemoveStudent(Student st) { studentGroup.Remove(st); }
public int LastNameComparer(Student st1, Student st2) { return st1.LastName.CompareTo(st2.LastName); }
public int GroupComparer(Student st1, Student st2) { return st1.Group.CompareTo(st2.Group); }
public int FirstNameComparer(Student st1, Student st2) { return st1.FirstName.CompareTo(st2.FirstName); }
public int DateTimeComparer(Student st1, Student st2) { return st1.DateOfBirth.CompareTo(st2.DateOfBirth); }
public void AddStudent(Student st) { studentGroup.Add(st); }