public void AddStudent(UserInfo userInfo, GroupID id)
{
var group = _groups.Find(it => it.Id == id);
if (group == null)
throw new GroupNotFoundException(String.Format("Can't find group : {0}", id.Id));
Student st = new Student(userInfo.FirstName, userInfo.LastName, userInfo.SecondName, userInfo.Uri, userInfo.Age);
group.AddStudent(st);
AddUser(st, "Student");
}
public Group(string id)
{
_id = new GroupID(id);
_students = new List<Student>();
}