The type or namespace name GridViewHelper could not be found
<p>Fist off, I'm very new to ASP.NET and Visual Web Developer Express.</p>

<p>I have a datagrid that I want to display subtotals in and have grouping.</p>

<p>I found this <a href="http://www.agrinei.com/gridviewhelper/gridviewhelper_en.htm" rel="nofollow">http://www.agrinei.com/gridviewhelper/gridviewhelper_en.htm</a> which looks great. I've added the classes files to my projects App_code folder and re-built the project. </p>

<p>But when I try and use the GridViewHelper I get the error "The type or namespace name GridViewHelper could not be found" </p>

<p>Tried adding using GridViewHelper; to the top of my page but that also gets underlined and the same error.</p>

<p>So how do I tell my project to use the classes I've added?? I think this is a really stupid question but I cant find an answer!</p>
