//public static void CreateWaitingForChild(dtoChildRegistrationToSubject waiting)
        //{
        //    Entities.context.ChildsRegistrationToSubjects.Add(dtoChildRegistrationToSubject.castToDal(waiting));
        //}
        public static void AddWaitingChild(dtoChildRegistrationToSubject child)
        {
            ChildsRegistrationToSubject Newchild = dtoChildRegistrationToSubject.castToDal(child);

            context.ChildsRegistrationToSubjects.Add(Newchild);
            context.SaveChanges();
        }
        public static void DeleteWaitingByObj(dtoChildRegistrationToSubject child)
        {
            var Child = context.ChildsRegistrationToSubjects.FirstOrDefault(p => p.ChildId == child.ChildId && p.SubjectId == child.SubjectId);

            if (Child != null)
            {
                context.ChildsRegistrationToSubjects.Remove(Child);
                context.SaveChanges();
            }
        }
 public static void SaveWaiting(dtoChildRegistrationToSubject waiting)
 {
     context.ChildsRegistrationToSubjects.Add(dtoChildRegistrationToSubject.castToDal(waiting));
 }