Add Identity framework to existing Database, Used Code-First approach

Question

I build MyApplication in layered style keeping the responsibility separate from other layers, I've added separate ClassLibraries for my DAL and ModelLayer.

• MyApplication (WebApp)
• MyApplication.DBAccessLayer (DAL) - ClassLibrary
• MyApplication.DBModelLayer (Entity Classes) - ClassLibrary

In my DataAccessLayer have Entity-Framework package installed, migration enabled and ModelLayer is referened in the DAL. I'm successfully able to do Automatic/Manual Migrations and maintain DB structure.

Now I want to add Identity Framework to incorporate Authentication & Authorization into my project. My question is, which layer should I add it on?

Following are my changes to add Identity, Please have a look. I appreciate Any suggestions or correction in my approach.

I'm new to .Net framework so please guide me if m wrong with my approach. I've tried implementing Identity Framework using ASP.MVC 5, Code-First Approach. I believe I'm half way through but while testing it, Every time I try to register user it fails in Account/Register()

 public async Task<ActionResult> Register(RegisterViewModel model)
    {
        if (ModelState.IsValid)
        {
            var user = new ApplicationUser { UserName = model.Email, 
                                             Email = model.Email };
            var result = await UserManager.CreateAsync(user, 
                                                       model.Password);
Here------> if (result.Succeeded)  <---- Here To be precise
            {
                await SignInManager.SignInAsync(user, 
                                               isPersistent:false, 
                                              rememberBrowser:false);
             }
         }}   

I've gone through different articles and learned the basics of Identity framework and how to do it. Installed following packages into DAL layer

PM> Install-Package Microsoft.AspNet.Identity.EntityFramework
PM> Install-Package Microsoft.AspNet.Identity.Owin 
PM> Install-Package Microsoft.Owin.Host.SystemWeb 

Moved WebApp/Models/IdentityModel.cs classes, which comes with the ASP.net MVC 5 template, moved it into my Model Library and AppDbContext class into my DAL library.

IdentityModel.cs Looks like

public class ApplicationUser : IdentityUser
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
    {
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        // Add custom user claims here
        return userIdentity;
    }
}

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext()
        : base("MyConnectionName", throwIfV1Schema: false)
    {
    }

    public static ApplicationDbContext Create()
    {
        return new ApplicationDbContext();
    }
}

Made by Context class extend ApplicationDbContext class defined in IdentityModel above.

public class Context : ApplicationDbContext
    {
        public Context() : base()
        {

        }
    }

Also added IdentityConfig class in App_Start folder, that is to be used by OWIN

public class IdentityConfig
{
    public void Configuration(IAppBuilder app)
    {
        app.CreatePerOwinContext(() => new ApplicationDbContext());
        app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
        app.CreatePerOwinContext<RoleManager<AppRole>>((options, context) =>
            new RoleManager<AppRole>(
                new RoleStore<AppRole>(context.Get<ApplicationDbContext>())));

        app.UseCookieAuthentication(new CookieAuthenticationOptions
        {
            AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
            LoginPath = new PathString("/Home/Login"),
        });
    }
}

and referenced it in web.config to be visible to OWIN

<appSettings>
    <!-- other settings -->
    <add key="owin:AppStartup" value="MyAppNamespace.IdentityConfig" />
</appSettings>

I've also updated my Database which added Identity Tables into my Database i.e AspNetRoles AspNetUserClaims AspNetLogins AspNetUserRoles AspNetUsers