C#

System.Data.Linq.EntitySet`1[BookLendingLib.Models.RentedBook]

<pre>private static IEnumerable<string> ToCsv<T>(IEnumerable<T> list)
        {
            var fields = typeof(T).GetFields();
            var properties = typeof(T).GetProperties();

            foreach (var @object in list)
            {
                yield return string.Join(",",
                                         fields.Select(x => (x.GetValue(@object) ?? string.Empty).ToString())
                                               .Concat(properties.Select(p => (p.GetValue(@object, null) ?? string.Empty).ToString()))
                                               .ToArray());
            }
        }

        private void ExportBookDb(string saveFilePath)
        {
            BookDBDataContext bDC = new BookDBDataContext();
            if (ExclBookList != null)
            {
                ExclBookList.Clear();
            }

            ExclBookList = new ObservableCollection<Book>(bDC.Books);
            Book bPropNames = new Book();
           
            using (StreamWriter textWriter = File.CreateText(saveFilePath + ".csv"))
            {
                textWriter.WriteLine(nameof(bPropNames.Id) + "," + nameof(bPropNames.Title) + "," + nameof(bPropNames.Author) + "," + nameof(bPropNames.Isbn) + "," + nameof(bPropNames.Quantity) + "," + nameof(bPropNames.RezervedQty));
                foreach (var line in ToCsv(ExclBookList))
                {                   
                    textWriter.WriteLine(line);
                }
            }

class Program
{
    private SDLWindow game;

    static int Main(string[] args)
    {
        int argIndex = args.Length;
        game = new SDLWindow();
        for (int i = 0; i < argIndex; i++)
        {
            switch (args[i])
            {
                case "-width":
                case "-w":
                    game.Width = int.Parse(args[++i]);
                    break;

                case "-height":
                case "-h":
                    game.Height = int.Parse(args[++i]);
                    break;

                case "-game":
                    // baseDir into modDir
                    break;

                default:
                    break;
            }
        }
        game.Run(60);
        return argIndex;
    }
}

class SDLWindow : GameWindow // From OpenTK 2.0 or 3.0pre
{
    public SDLWindow()
    {
        WindowBorder = WindowBorder.Fixed;
    }
}