POST запрос к Telegram

var client = new HttpClient();
Uri u = new Uri("https://api.telegram.org/bot" + SecretKey.API_KEY + "/" + "sendMessage");
var payload = new TelegramRequestParameter.sendMessageParameter
            {
                text = "Текст",
                chat_id = 896172479,
                parse_mode = "Markdown",
                disable_notification = true,
                disable_web_page_preview = false,
                reply_to_message_id = e.message.message_id
            };
 string strPayload = JsonConvert.SerializeObject(payload, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });
 HttpContent c = new StringContent(strPayload, Encoding.UTF8, "application/json");
 HttpRequestMessage request = new HttpRequestMessage
            {
                Method = HttpMethod.Post,
                RequestUri = u,
                Content = c
            };
 
HttpResponseMessage result = await client.SendAsync(request);

var button1 = new TelegramClass.InlineKeyboardButton { text = "Текст1", url = "https://core.telegram.org/bots/api#sendmessage" };
var button2 = new TelegramClass.InlineKeyboardButton { text = "Текст2", url = "https://core.telegram.org/bots/api#sendmessage" };
TelegramClass.InlineKeyboardButton[] mas = { button1, button2};
var test = new TelegramClass.InlineKeyboardMarkup(mas);
 
var payload = new TelegramRequestParameter.sendMessageParameter
            {
                text = "Текст",
                chat_id = 896172479,
                parse_mode = "Markdown",
                disable_notification = true,
                disable_web_page_preview = false,
                reply_to_message_id = e.message.message_id,
                reply_markup = test
            };