BooksCacheClient.ViewModels.BooksViewModel.PostBookAsync C# (CSharp) Method

        public async void PostBookAsync()
        {
            var message = new ValueSet();
            message.Add("command", "POST");
            string json = new Book { Title = NewBookTitle, Publisher = NewBookPublisher }.ToJson();
            message.Add("book", json);
            string result = await SendMessageAsync(message);
        }
        private async Task<string> SendMessageAsync(ValueSet message)