2

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace Izpit_zad_2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void BT2_Click(object sender, EventArgs e)
        {
            FileStream f = new FileStream("Studenti.txt", FileMode.Create, FileAccess.Write);
            BinaryWriter s = new BinaryWriter(f);
            string ime;
            string nomer;
            string grupa;
            string ocenka;
            for (int i = 0; i < DGV1.RowCount - 1; i++)
            {
                ime = DGV1[0, i].Value.ToString();
                nomer = DGV1[1, i].Value.ToString().ToUpper();
                grupa = DGV1[2, i].Value.ToString();
                ocenka = DGV1[3, i].Value.ToString();
                s.Write(ime);
                s.Write(nomer);
                s.Write(grupa);
                s.Write(ocenka);
            }
            f.Close();
            s.Close();
            DGV1.Rows.Clear();
        }

        private void BT1_Click(object sender, EventArgs e)
        {
            LB1.Items.Clear();
            int slab = 2;
            FileStream f = new FileStream("Studenti.txt", FileMode.Open, FileAccess.Read);
            BinaryReader s = new BinaryReader(f);
            string ime;
            string nomer;
            string grupa;
            string ocenka;
            while (f.Position < f.Length)
            {
                ime = s.ReadString();
                nomer = s.ReadString();
                grupa = s.ReadString();
                ocenka = s.ReadString();
                if (grupa == TB1.Text.ToUpper())
                {
                    LB1.Items.Add(ime + "  " + nomer);
                }
                int score = int.Parse(ocenka);
                if (score == slab)
                {
                    LB2.Items.Add(ime + "  " + nomer + "  " + ocenka);
                }
            }
            f.Close();
            s.Close();
        }
    }
}