CSSScript.SearchDirs.upBtn_Click C# (CSharp) Метод

        private void upBtn_Click(object sender, EventArgs e)
        {
            int index = listBox1.SelectedIndex;
            if (index == 0 || listBox1.SelectedItem == null)
                return;

            string dir = listBox1.SelectedItem.ToString();
            listBox1.Items.RemoveAt(index);
            listBox1.Items.Insert(index - 1, dir);
            listBox1.SelectedIndex = index - 1;
            modified = true;
            ok.Enabled = apply.Enabled = modified;
        }
    }