Can't find ListValidator in CodeBehind

Hello everyone,

I've created a CustomListValidator as described in the article http://www.dotnetcurry.com/ShowArticle.aspx?ID=197.
So I created the file ListValidator.vb in the App_Code folder, and added the Register line on the page where I want to use the ListValidator.
On the page I where I use this, I added
<%@ Register TagPrefix="CLV" Namespace="CustomListValidator" %>

and added the ListV ...