ocena.asmx.cs drugi zadatak

[System.Web.Services.WebMethod]
        public double ucitajOcenu(string Ime, string Prezime)
        {
            List<string> lista = ucitajUcenike();
            double ProsecnaOcena = 0;
            string[] podatak;

            foreach (string line in lista)
            {
                podatak = line.Split('|');
                if (Ime.Contains(podatak[0]) && Prezime.Contains(podatak[1]))
                {
                    ProsecnaOcena = Double.Parse(podatak[2]);
                }
            }

            return ProsecnaOcena;
        }

        [System.Web.Services.WebMethod]
        public bool dodajUcenike(string Ime, string Prezime, double ProsecnaOcena)
        {
            List<string> lista = ucitajUcenike();
            string line = Ime + "|" + Prezime + "|" + ProsecnaOcena;
            lista.Add(line);
            try
            {
                StreamWriter sw = new StreamWriter(HttpContext.Current.Server.MapPath("~/Ucenici.txt"));
                foreach (string l in lista)
                {
                    sw.WriteLine(l);
                }
                sw.Close();
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
            return true;
        }

        [System.Web.Services.WebMethod]
        public List<string> ucitajUcenike()
        {
            List<string> lista = new List<string>();
            try
            {
                StreamReader sr = new StreamReader(HttpContext.Current.Server.MapPath("~/Ucenici.txt"));
                string line = sr.ReadLine();
                while (!string.IsNullOrEmpty(line))
                {
                    //string[] polje = line.Split('|');
                    lista.Add(line);
                    line = sr.ReadLine();
                }
                sr.Close();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
            return lista;
        }
    }
}