private void Dfs2()
        {
            FileInfo fi = new FileInfo(textBoxFile12.Text);

            if (!fi.Exists)
            {
                richTextBoxStatus.Text = "File [" + fi.FullName + "] does not exist.\r\n";
                return;
            }

            using (DFS2 dfs2 = new DFS2(fi))
            {
                dfs2.CSSPDHIChanged += CSSPDHIChanged;
                dfs2.ReadFile();
                dfs2.CSSPDHIChanged -= CSSPDHIChanged;
            }
        }