void lbtnParentFolder_Click(object sender, EventArgs e)
    {
        String parFolder = PathConverter.GetInstance().GetParentDirectory(path);

        if (parFolder == this.parentDirectory)
        {
            parFolder = PathConverter.GetInstance().GetParentDirectory(parFolder);
        }

        Response.Redirect(String.Format("{0}{1}?Path={2}", baseUrl, pageFilename, parFolder));
    }