#r "nuget:Telegram.Bot/15.7.1"
using Telegram.Bot;
using Telegram.Bot.Types;
using Telegram.Bot.Types.ReplyMarkups;
var botClient = new TelegramBotClient("YOUR_ACCESS_TOKEN_HERE");
var keyboardMarkup = new ReplyKeyboardMarkup(new List<List<KeyboardButton>>{
new() {new("A"), new("B")},
new() {new("C"), new("D")}
});
await botClient.SendTextMessageAsync(new ChatId(123), "Hello world", replyMarkup: keyboardMarkup