private void LoadButton_Click(object sender, EventArgs e)
        {
            System.IO.StreamReader file = new System.IO.StreamReader(@"C:\Users\ASUS\source\repos\SystemOcen\plik.txt");
            var last = "";
            int couter = 0;

            while ((line = file.ReadLine()) != null)
            {
                if (couter == 0)
                {
                    string[] par = line.Split(' ');
                    var i = par[0];

                    var rateAdd = par[1];
                    var dateAdd = par[2];
                    var rate = new Rate()
                    {
                        rateValue = Int32.Parse(rateAdd),
                        date = dateAdd
                    };

                    last = i;
                    subjects.Add(new Subject()
                    {
                        name = i,
                    });
                    var sb = subjects.Select(p => p).Last();
                    sb.rates.Add(rate);
                }

                if (couter > 0)
                {
                    string[] par = line.Split(' ');
                    var i = par[0];
                    var rateAdd = par[1];
                    var dateAdd = par[2];

                    if (last != i)
                    {
                        subjects.Add(new Subject()
                        {
                            name = i,
                        });
                        var rate = new Rate()
                        {
                            rateValue = Int32.Parse(rateAdd),
                            date = dateAdd
                        };
                        var sb = subjects.Select(p => p).Last();
                        sb.rates.Add(rate);
                        last = i;
                    }
                    if (last == i)
                    {
                        var rate = new Rate()
                        {
                            rateValue = Int32.Parse(rateAdd),
                            date = dateAdd
                        };
                        var sb = subjects.Select(p => p).Last();
                        sb.rates.Add(rate);
                    }


                }

                couter++;
            }
            foreach (var item in subjects)
            {
                listBox1.Items.Add(item);
            }

        }