I'm trying to get a list of items whose checkboxlist(ArticleTagTypes) match the querystring but not when #all. It doesnt seem to work. I think its my where clause in my second selectedArticles def but not sure. Also, I keep getting errors for the Split and Contains functions. Any Ideas?

var articles = Umbraco.Content(1096);

var paging = Paging.GetPages(articles.Children.Count(), 2);

var selectedArticles = articles.Children.OrderBy("CreateDate").Where("Visible").Skip(paging.Skip).Take(paging.Take).ToList();

    if (Request.QueryString["tag"] != "all")    {

        selectedArticles = articles.Children.OrderBy("CreateDate").Where("Visible && ArticleTagType.Value.ToString().Split(',').Contains(@0)",Request.QueryString[""]).Skip(paging.Skip).Take(paging.Take).ToList();

    }

}