using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace asdasd
{
    class Program
    {
        static void Main(string[] args)
        {
            var directory = Directory.GetDirectories(@"E:\Downloads\.vs\Library\v16");

            var files = FindFiles(@"E:\Downloads", "jpg", new List<string>());

            Console.WriteLine();
        }

        static List<string> FindFiles(string path, string extension, List<string> list)
        {
            if (path.Length == 0) return list;

            foreach (var p in Directory.GetDirectories(path))
            {
                var files = Directory.GetFiles(p);
                foreach (var file in files)
                {
                    var name = file.Split("\\");
                    var ext = name[name.Length - 1].Split('.');
                    if (ext.Length != 2) continue;
                    if (ext[1] == extension) list.Add(file);
                }
                FindFiles(p, extension, list);
            }


            return list;
        }

    }
}