Seeding ASP.NET MVC 5 Identity database

Configure.cs

internal sealed class Configuration : DbMigrationsConfiguration<_1_Identity.Models.ApplicationDbContext>
    {
        public Configuration()
        {
            AutomaticMigrationsEnabled = true;                          // Set to true if you want to migrate every time app is restarted.
            ContextKey = "_1_Identity.Models.ApplicationDbContext";     // This property seems to be mutually exclusive with MigrationsDirectory.
            MigrationsDirectory = @"DataContexts\IdentityMigrations";
        }

        protected override void Seed(_1_Identity.Models.ApplicationDbContext context)
        {
            // Check if user exists and create a new one.
            if (!context.Users.Any(u => u.UserName == "admin@a.com"))
            {
                IUserStore<ApplicationUser> store = new UserStore<ApplicationUser>(context);
                UserManager<ApplicationUser> manager = new UserManager<ApplicationUser>(store);
                ApplicationUser user = new ApplicationUser { UserName = "admin@a.com", Email = "admin@a.com" };
                manager.Create(user, "Password_1");
            }
        }
    }