BookServiceClientApp.Program.UpdateChapterAsync C# (CSharp) Метод

        private static async Task UpdateChapterAsync()
        {
            WriteLine(nameof(UpdateChapterAsync));
            var client = new BookChapterClient(Addresses.BaseAddress);
            var chapters = await client.GetAllAsync(Addresses.BooksApi);
            var chapter = chapters.SingleOrDefault(c => c.Title == "Windows Store Apps");
            if (chapter != null)
            {
                chapter.Number = 32;
                chapter.Title = "Windows Apps";
                await client.PutAsync(Addresses.BooksApi + chapter.Id, chapter);
                WriteLine($"updated chapter {chapter.Title}");
            }

            WriteLine();
        }