string targetDirectory;
          List<Filmek> osztaly = new List<Filmek>();
        List<string> mufajok = new List<string>();
        protected void Page_Load(object sender, EventArgs e)
        {
            targetDirectory = Server.MapPath("~/musor/");
            if (!IsPostBack)
            {
                FilmDatum();
                FilmOsztaly();
                FilmMufaj();
            }
        }

        protected void FilmDatum() {
            String[] Files = Directory.GetFiles(targetDirectory, "*.txt");
            for (int x = 0; x < Files.Length; x++)
            {
                Files[x] = Path.GetFileNameWithoutExtension(Files[x]);
            }
            DropDownList1.DataSource = Files;
            DropDownList1.DataBind();
        }

        protected void FilmOsztaly() {
            string filename = Server.MapPath("~/musor/" + DropDownList1.SelectedItem.Text + ".txt");
            using (StreamReader reader = new StreamReader(filename))
            {
                string line;
                while ((line = reader.ReadLine()) != null)
                {
                    string[] sor = line.Split('|').ToArray();
                    foreach (string item in sor)
                    {
                        item.Trim();
                    }
                    Filmek film = new Filmek();
                    film.Ido = sor[0];
                    film.Cim = sor[1];
                    film.Mufaj =sor[2];
                    film.Ikon =sor[3].Trim();
                    osztaly.Add(film);
                }
            }
        }
        protected void FilmMufaj()
        {
            string filename = Server.MapPath("~/musor/" + DropDownList1.SelectedItem.Text + ".txt");
            using (StreamReader reader = new StreamReader(filename))
            {
              string line;
                while ((line = reader.ReadLine()) != null)
                {
                    string[] sor = line.Split('|').ToArray();
                    foreach (string item in sor)
                    {
                        item.Trim();
                    }
                  mufajok.Add(sor[2]);
                }
            }
            mufajok = mufajok.Distinct().ToList<string>();
            DropDownList2.DataSource = mufajok;
            DropDownList2.DataBind();
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            List<Filmek> eredmeny = osztaly;
            if (DropDownList1.SelectedIndex > -1)
            {
                FilmOsztaly();
                if (DropDownList2.SelectedIndex > -1)
                {
                    eredmeny = eredmeny.FindAll(i=>i.Mufaj.Contains(DropDownList2.SelectedItem.Text));
                }

                GridView1.DataSource = eredmeny;
                GridView1.DataBind();
            }
        }