public IActionResult OnPostOk() { if (ModelState.IsValid) { Tour.Id = ObjectId.GenerateNewId().ToString(); Tour.Country = Converter.GetCountry(); Tour.City = Converter.GetCity(); Tour.Accomodation = Converter.GetAccomodation(); Tour.AgenciesId = Converter.GetAgency(); Tour.ExcursionsId = Converter.GetExcursion(); _agencyList.SynchronizeAdding(Tour); _excursionList.SynchronizeAdding(Tour); _tourList.Add(Tour); return(RedirectToPage("Tours", new { userId = UserId })); } return(Page()); }