using System;

using System.IO;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        string[] ebookExt = {".epub", ".mobi", ".pdf", ".html", ".rtf", ".odt", ".doc", ".docx", ".cbr", ".cbz", ".exe"};

        string[] items = Directory.GetFiles(Directory.GetCurrentDirectory());

        foreach (string item in items)

        {

            if (ebookExt.Any(ext => ext.EndsWith(item)))

            {

                Console.WriteLine(item);

            }

        }

    }

}