public async Task <IEnumerable <VendorResponse> > GetByEventId(Guid id) { var vendors = await _vendorRepository.GetByEventId(id); var allVendors = await _vendorRepository.GetAsync(); var result = allVendors.Where(v => vendors.All(x => x.Id != v.Id)); /*var result = await _vendorRepository.GetByEventId(id);*/ return(result.Select(x => _vendorMapper.Map(x))); }