var botClient = new TelegramBotClient(token);
...
var me = await botClient.GetMeAsync();

List<MenuButtonModel> buttonModels = new()
{
    new MenuButtonModel("Button1", "Button1Value"),
    new MenuButtonModel("Button2", "Button2Value"),
    new MenuButtonModel("Button3", "Button3Value"),
    new MenuButtonModel("Button4", "Button4Value"),
    new MenuButtonModel("Button5", "Button5Value"),
    new MenuButtonModel("Button6", "Button6Value"),
    new MenuButtonModel("Button7", "Button7Value"),
    new MenuButtonModel("Button8", "Button8Value"),
    new MenuButtonModel("Button9", "Button9Value"),
};

const int columnCount = 2;
const int rowCount = 3;
var replyMenu = botClient.GetPaginationInlineKeyboard(buttonModels, columnCount, rowCount);
await botClient.SendTextMessageAsync(chatId, "YourMessage", replyMarkup: replyMenu);

// clickedNavigation - Data from CallbackQuery
var replyMenu = client.GetPaginationInlineKeyboard(buttonModels, columnCount, rowCount, clickedNavigation);
await botClient.EditMessageReplyMarkupAsync(chatId, messageId, replyMenu);

var childrenItems = new List<MenuButtonModel>() { new MenuButtonModel("ButtonInside", "InsideData") };
var item = new MenuButtonModel("Button1", "Button1Value", childrenItems);

// Default values
public static class Settings
{
    public static string ButtonNextText = "»";
    public static string ButtonPrevText = "«";
    public static string ButtonUpText = "« up";
    public const string PaginationData = "toPage";
}
...
// Custom values
Settings.ButtonNextText = "👉";
Settings.ButtonPrevText = "👈";