Compiler Error Message: CS0103 in MVC app (The name 'Html' does not exist in the current context)

Please look at this sample code and my question followed:

<%@ Page Title="" Language="C#" 
MasterPageFile="~/Views/Shared/Site.Master" 
Inherits="System.Web.Mvc.ViewPage" %>

<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
<% Html.RenderPartial("~/Views/Shared/Message.ascx"); %>
<form method="post" action="<%= Url.Action(this.ViewContext.RouteData.Values["action"] as string, "Article") %>" class="article-create">
		
	<h3>Article</h3>
	<p><label for="categoryId">Category</label><br />
                     <%= Html.DropDownList("categoryId")%></p>		
	<p><label for="title">Title</label><br />
	<%= Html.TextBox("title", ViewData["title"], new { @maxlength = 256 })%>
</form>
</asp:Content>

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When I move my mouse over to one of the Html's it says:

HtmlHelper.ViewPage.Html
Returns a System.Web.Mvc.HtmlHelper contains methods useful for rendering html elements.

However, I've gotten this CS0103 on a page with a slightly different Inherits attribute

<%@ Page Language="C#" 
MasterPageFile="~/Views/Shared/Site.Master" 
Inherits="System.Web.Mvc.ViewPage<IEnumerable<MyApplicationProject.Models.Category>>" %>

<asp:Content ID="MainContent" ContentPlaceHolderID="MainContent" runat="server">
<div id="categories">
<% foreach (Category category in ViewData.Model) { %>
	<div class="admin">
		<%= Html.ActionLink("Edit", "EditCategory", new { controller = "Article", categoryId = category.CategoryID })%>&nbsp;|&nbsp;
		<%= Html.ActionLink("Remove", "RemoveCategory", new { controller = "Article", categoryId = category.CategoryID })%>
	</div>
	<% Html.RenderPartial("~/Views/Shared/Article/CategoryItem.ascx", category); %>
	<hr />
<% } %>
</div>
</asp:Content>

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What wrong is that all the 'Html''s are underlined in red in my VS2008.
So I wanted to see what would happen when I remove <IEnumerable<MyApplicationProject.Models.Category>> I noticed the index obj (Category) in my loop remain underlined in red whether I remove the IEnumerable portion of the inherits attribute or not - but that's a different issue (i.e. The type or namespace name 'Category' could not be found (are you missing a using directive or an assembly reference?) However, all the Html's were no longer underlined (I supposed the errors were gone in this case)

For now, I wonder how I  go about to fix the html errors with the <IEnumerable<MyApplicationProject.Models.Category>> intact for my loop. My entired project compiles OK regardless, but when it comes to individual page as I open it in VS2008, all those html's got underlined in red; and it says 'The name html does not exist in the current context' on mouse over (don't even need to run it to see the CS0103 Compiler error, arg it is so frustrating to look at them)  (Are these complile errors only fixed at run-time or something? I think I've got MyApplicationProject.Models referenced. Thank you for reading.)

BTW I supplied the namespace for the Category as shown (MyApplicationProject.Models) but the error woudln't go away. What else do I miss?