Configureauth name does not exist

Question

I am trying to use this tutorial http://httpjunkie.com/2013/311/adding-mvc-5-identity-to-an-existing-project/ but it shows me an error Error 5 The name "ConfigureAuth" does not exist in the current context
this is my startup.cs class

using System; using System.Collections.Generic; using System.Linq; using System.Web; using Microsoft.Owin; using Owin; [assembly: OwinStartupAttribute(typeof(TicketSystem.Startup))] namespace TicketSystem { public partial class Startup { public void Configuration(IAppBuilder app) { ConfigureAuth(app); } } } 

this is Startup.Auth.cs

 using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; using Microsoft.AspNet.Identity; using Microsoft.Owin; using Microsoft.Owin.Security.Cookies; using Owin; namespace TicketSystem.App_Start { public partial class Startup { // For more information on configuring authentication, please visit http://go.microsoft.com/fwlink/?LinkId=301864 public void ConfigureAuth(IAppBuilder app) { // Enable the application to use a cookie to store information for the signed in user app.UseCookieAuthentication(new CookieAuthenticationOptions { AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie, LoginPath = new PathString("/Account/Login") }); // Use a cookie to temporarily store information about a user logging in with a third party login provider app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie); // Uncomment the following lines to enable logging in with third party login providers //app.UseMicrosoftAccountAuthentication( // clientId: "", // clientSecret: ""); //app.UseTwitterAuthentication( // consumerKey: "", // consumerSecret: ""); //app.UseFacebookAuthentication( // appId: "", // appSecret: ""); //app.UseGoogleAuthentication(); } } } 

Answer 1

Both files have different namespaces: namespace TicketSystem.App_Start and namespace TicketSystem . Make sure they are the same. Or, alternatively, add a using: using TicketSystem.App_Start in your startup.cs class. If you check the example, you will see that both files use the same namespace ( namespace MVC5FullApp )