public ActionResult Roles()
        {
            var context = HttpContext.GetOwinContext();
            var roleManager =
                new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(context.Get<ApplicationDbContext>()));

            var roles = roleManager.Roles.ToList();

            return View(roles);
        }

        public ActionResult Roles()
        {
            var ident = (ClaimsIdentity)User.Identity;
            var roles = ident.FindAll("http://schemas.microsoft.com/ws/2008/06/identity/claims/role")
                .Select(v => v.Value);

            return View(roles);
        }

    public class AppAuthenticationOptions : CookieAuthenticationOptions
    {
        public AppAuthenticationOptions()
        {
            AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie;
            Provider = new CookieAuthenticationProvider { OnValidateIdentity = ValidateIdentity };
        }

        async Task ValidateIdentity(CookieValidateIdentityContext ctx)
        {
            var userManager = DependencyResolver.Current.GetService<AppUserManager>();
            var userID = ctx.Identity.GetUserId();

            if (string.IsNullOrEmpty(userID) == false)
            {
                var user = await userManager.FindByIdAsync(userID);

                if (user != null)
                {
                    var identity = await userManager.CreateIdentityAsync(user, DefaultAuthenticationTypes.ApplicationCookie);
                    ctx.ReplaceIdentity(identity);
                    return;
                }
            }

            ctx.RejectIdentity();
        }        
    }