Default.aspx drugi zadatak

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;

namespace WebApplication4
{
    public partial class _Default : System.Web.UI.Page
    {
        private ocena o = new ocena();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (DropDownList1.Items.Count == 0)
            {
                List<string> lista = napuniListu();

                DropDownList1.Items.Clear();
                foreach (string line in lista)
                {
                    DropDownList1.Items.Add(line);
                }
            }
        }

        private List<string> napuniListu()
        {
            List<string> lista = new List<string>();
            try
            {
                StreamReader sr = new StreamReader(HttpContext.Current.Server.MapPath("~/Ucenici.txt"));
                string line = sr.ReadLine();
                string[] a;
                while (!string.IsNullOrEmpty(line))
                {
                    a = line.Split('|');
                    line = a[0] + " " + a[1];
                    lista.Add(line);
                    line = sr.ReadLine();
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
            return lista;
        }

        protected void Button1_Click1(object sender, EventArgs e)
        {
            string line = DropDownList1.SelectedItem.Text;
            string[] info = line.Split(' ');
            Label1.Text = "Prosecna ocena: " + o.ucitajOcenu(info[0], info[1]);
        }
    }
}