EF4 Code First template Global.asax.cs

using System;
using System.Configuration;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
using Microsoft.WebPages.Compilation;
using MyApp.Fixtures;
using MyApp.Models;
using MyApp.Services;

namespace MyApp
{
	public class Db : DbContext
	{
		public DbSet<Role> Roles { get; set; }
		public DbSet<User> Users { get; set; }
	}

	public class App : System.Web.HttpApplication
	{
		const string SessionKey = "Db.Session";

		public static Db Db
		{
			get
			{
				return (Db)HttpContext.Current.Items[SessionKey];
			}
		}

		public App()
		{
			BeginRequest += MvcApplication_BeginRequest;
			AuthenticateRequest += MvcApplication_AuthenticateRequest;
			EndRequest += MvcApplication_EndRequest;
		}

		void MvcApplication_BeginRequest(object sender, EventArgs e)
		{
			HttpContext.Current.Items[SessionKey] = new Db();
		}

		void MvcApplication_AuthenticateRequest(object sender, EventArgs e)
		{
			if (HttpContext.Current.Request.Path.Contains("assets/"))
				return;
			AccountService.AuthenticateRequest();
		}

		void MvcApplication_EndRequest(object sender, EventArgs e)
		{
			var disposable = HttpContext.Current.Items[SessionKey] as IDisposable;
			if (disposable != null)
				disposable.Dispose();
		}

		protected void Application_Start()
		{
			Database.SetInitializer<Db>(new DbInitializer());

			AreaRegistration.RegisterAllAreas();
			RegisterGlobalFilters(GlobalFilters.Filters);
			RegisterRoutes(RouteTable.Routes);
		}

		public static void RegisterGlobalFilters(GlobalFilterCollection filters)
		{
			filters.Add(new HandleErrorAttribute());
		}

		public static void RegisterRoutes(RouteCollection routes)
		{
			// turn off the unnecessary file exists check
			routes.RouteExistingFiles = true;
			routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
			routes.IgnoreRoute("assets/{*pathInfo}");
			routes.IgnoreRoute("favicon.ico");

			routes.MapRoute(
				"Default",
				"{controller}/{action}/{id}",
				new { controller = "Home", action = "Index", id = UrlParameter.Optional },
				new[] { "MyApp.Controllers" }
			);

		}

	}

}

Example: var user = App.Db.Users.Find(id);