public void Edit(RepresentativeUser representativeUser)
        {
            _dbContext.Entry(representativeUser).State = EntityState.Modified;

        }
 public void Add(RepresentativeUser representativeUser)
 {
     _representativeUsers.Add(representativeUser);
 }
        public void Delete(int representativeUserId)
        {
            var representativeUser = new RepresentativeUser() { Id = representativeUserId };

            _representativeUsers.Attach(representativeUser);
            _representativeUsers.Remove(representativeUser);
        }