InitizlizeRoles

 public class AppDbInitializer : DropCreateDatabaseAlways<ApplicationContext>
    {

        protected override void Seed(ApplicationContext context)
        {
            var userManager = new ApplicationUserManager(new UserStore<ApplicationUser>(context));
            var roleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(context));


            var roleAdmin = new IdentityRole { Name = "admin" };
            var roleUser = new IdentityRole { Name = "user" };

            roleManager.Create(roleAdmin);
            roleManager.Create(roleUser);




            var admin = new ApplicationUser { Email = "somemail@mail.ru", UserName = "somemail@mail.ru" };
            string password = "12345678";


            var result = userManager.Create(admin, password);



            if(result.Succeeded)
            {
                userManager.AddToRole(admin.Id, roleAdmin.Name);
                userManager.AddToRole(admin.Id, roleUser.Name);
            }


            base.Seed(context);
        }

    }
}