private void AddButton_Click_1(object sender, EventArgs e)
        {
            if (int.TryParse(AddTextBox.Text, out int value))
            {
                var item = new SortedItem(value, items.Count);
                items.Add(item);

                DrawItems(items);
            }

            RefreshItems();

            AddTextBox.Text = "";
        }
        private void FillButton_Click_1(object sender, EventArgs e)
        {
            if (int.TryParse(FillTextBox.Text, out int value))
            {
                var rnd = new Random();

                for (int i = 0; i < value; i++)
                {
                    var item = new SortedItem(rnd.Next(100), items.Count);
                    items.Add(item);
                }
            }
            RefreshItems();

            FillTextBox.Text = "";
        }