public async Task RegisterAsync()
        {
            var registrationResource = new CreateRegistrationResource()
            {
                EventId = _event.Id
            };

            await RegistrationService.CreateRegistrationAsync(registrationResource);

            _event = await EventService.GetEventByIdAsync(Id);
        }
        public async Task CreateRegistrationAsync(CreateRegistrationResource resource)
        {
            var resourceJson = new StringContent(JsonConvert.SerializeObject(resource), Encoding.UTF8, "application/json");

            await _httpClient.PostAsync($"{BaseRegistrationsApiUrl}", resourceJson);
        }