string targetDirectory;
        List<zenek> osztaly = new List<zenek>();
        List<string> datumok = new List<string>();
        List<string> mufajok = new List<string>();
        List<zenek> eredmeny = new List<zenek>();

        protected void Page_Load(object sender, EventArgs e)
        {
            targetDirectory = Server.MapPath("~/zenek/");
            if (!IsPostBack)
            {
                FillZsaner();
                FillOsztaly();
                FillDatum();
                DropDownList1.Items.Insert(0, " ");
                DropDownList1.SelectedIndex = 0;
                DropDownList2.Items.Insert(0, " ");
                DropDownList2.SelectedIndex = 0;
            }
        }

        protected void FillZsaner()
        {
            string filename = Server.MapPath("~/zenek/cd_katalogus.txt");
            using (StreamReader reader = new StreamReader(filename))
            {
                string line;
                while ((line = reader.ReadLine()) != null)
                {
                    string[] sor = line.Split('|').ToArray();
                    mufajok.Add(sor[2].Trim());
                }
            }
            mufajok = mufajok.Distinct().ToList<string>();
            DropDownList1.DataSource = mufajok;
            DropDownList1.DataBind();
        }

        protected void FillDatum()
        {
            string filename = Server.MapPath("~/zenek/cd_katalogus.txt");
            using (StreamReader reader = new StreamReader(filename))
            {
                string line;
                while ((line = reader.ReadLine()) != null)
                {
                    string[] sor = line.Split('|').ToArray();
                    datumok.Add(sor[3].Trim());
                }
            }
            datumok = datumok.Distinct().ToList<string>();
            DropDownList2.DataSource = datumok;
            DropDownList2.DataBind();
        }
        protected void FillOsztaly()
        {
            string filename = Server.MapPath("~/zenek/cd_katalogus.txt");
            using (StreamReader reader = new StreamReader(filename))
            {
                string line;
                while ((line = reader.ReadLine()) != null)
                {
                    string[] sor = line.Split('|').ToArray();
                    zenek x = new zenek();
                    x.Eloado = sor[0].Trim();
                    x.Album = sor[1].Trim();
                    x.Zsaner = sor[2].Trim();
                    x.Ev = sor[3].Trim();
                    x.Kiadohaz = sor[4].Trim();
                    x.Ikon = sor[5].Trim();
                    osztaly.Add(x);
                }

            }
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            FillOsztaly();
            List<zenek> eredmeny = osztaly;
            if (TextBox1.Text != " ") {
                eredmeny = eredmeny.Where(i => i.Eloado.StartsWith(TextBox1.Text)).ToList();
            }
            if (TextBox2.Text != " ") {
                eredmeny = eredmeny.Where(i => i.Album.StartsWith(TextBox2.Text)).ToList();
            }
            if (TextBox3.Text != " ") {
                eredmeny = eredmeny.Where(i => i.Kiadohaz.StartsWith(TextBox3.Text)).ToList();
            }
            if (DropDownList1.SelectedIndex > 0) {
                eredmeny = eredmeny.Where(i => i.Zsaner.StartsWith(DropDownList1.SelectedItem.Text)).ToList();
            }
            if (DropDownList2.SelectedIndex > 0) {
                eredmeny = eredmeny.Where(i => i.Ev.StartsWith(DropDownList2.SelectedItem.Text)).ToList();
            }
            GridView1.DataSource = eredmeny;
            GridView1.DataBind();
        }