public ActionResult Article(string articleSlug)
{
if (articleSlug == null)
{
throw new HttpException(404, "An article must be specified.");
}
var builder = new ArticleBuilder();
var article = builder.ValidateArticle(articleSlug);
if (article == null)
{
throw new HttpException(404, "The specified article was not found.");
}
return(View(article));
}