private void txtFileExist_TextChanged(object sender, EventArgs e)
        {
            TextBox txt = sender as TextBox;

            TipShow.SetToolTip(txt, txt.Text);

            if (!txt.Focused)
            {
                txt.SelectionStart = txt.Text.Length;
            }

            Match mch = Regex.Match(txt.Text, chanRegex, RegexOptions.IgnoreCase);

            errorShow.SetError(txt, null);
            if (!mch.Groups[0].Success || !File.Exists(txt.Text))
            {
                btnCfgOk.Enabled = false;
                errorShow.SetError(txt, "文件不存在");
            }
            else
            {
                btnCfgOk.Enabled = true;
            }
        }