public async Task AddProduct() { if (_createdProduct.Name == null || _createdProduct.Name == "" || _createdProduct.Stock <= 0) { ErrorString = (string)Application.Current.FindResource("InvalidProductError"); return; } _createdProduct.NullNavigationProperties(); using (var client = new HttpClient()) { client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); ProductDto content = createProductDto(_createdProduct); var json = Newtonsoft.Json.JsonConvert.SerializeObject(content); URLBuilder url = new URLBuilder(controler); var request = new HttpRequestMessage() { RequestUri = new Uri(url.URL), Method = HttpMethod.Post, Content = new StringContent(json, Encoding.UTF8, "application/json") }; request.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(string.Format("{0}:{1}", _authenticationUser.UserId.ToString(), _authenticationUser.Password)))); var response = await client.SendAsync(request); if (response.IsSuccessStatusCode) { Products.Add(_createdProduct); _createdProduct = ProductWrapper.CreateEmptyProduct(_user); } else { ErrorString = (string)Application.Current.FindResource("InsertProductError"); return; } } ErrorString = null; }