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In my database schema each forum has a category and categories can have many forums. I'm trying to list categories and their respective forums with the following code: <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<dynamic>" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> Index </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>Index</h2> <% foreach (GameSite.Models.Category category in (IEnumerable)ViewData["Categories"]) { %> <%= category.Name %> <% foreach (GameSite.Models.Forum forum in (IEnumerable)category.Forums) { %> <%= forum.Name %> <% } %> <% } %> </asp:Content> When this is run I get the following error: Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS0012: The type 'System.Data.Linq.EntitySet`1<T0>' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. Source Error: Line 11: { %> Line 12: <%= category.Name %> Line 13: <% foreach (GameSite.Models.Forum forum in (IEnumerable)category.Forums) Line 14: { %> Line 15: <%= forum.Name %> I can confirm that System.Data.Linq is being referenced in my project. Any ideas?

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