registro de usuarios

public async static Task<bool> RegisterUser(usuarios user, string jsonString)
        {
            //llamaremos el metodo PostAsync mandandole el json
            HttpClient httpClient = new HttpClient();
            JsonObject jsonObject = JsonObject.Parse(jsonString);
            HttpStringContent httpStringContent = new HttpStringContent(jsonString, Windows.Storage.Streams.UnicodeEncoding.Utf8, "application/json");
            Uri uri = new Uri("http://192.168.1.2/laravelplan/public/api/rest/users/store");
            HttpResponseMessage response = new HttpResponseMessage();

            try
            {
                response = await httpClient.PostAsync(uri, httpStringContent);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK);
            }
            if (!response.IsSuccessStatusCode)
            {
                string message = response.Content.ToString();
                MessageBox.Show(message, "error", MessageBoxButton.OK);

            }
            return true;
        }