How can I check if a user exists in my Login action?

Question

I am starting to use the new identity management and have a simple need. When my user logs in with a wrong name it reports a password error. How can I change this so that it also checks to see if the username exists using the dbcontext method ?

    public ActionResult Login(LoginViewModel model, string returnUrl)
    {
        if (ModelState.IsValid)
        {
            // Validate the password
            IdentityResult result = IdentityManager.Authentication.CheckPasswordAndSignIn(AuthenticationManager, model.UserName, model.Password, model.RememberMe);
            if (result.Success)
            {
                return Redirect("~/home");
            }
            else
            {
                AddErrors(result);
            }
        }

        // If we got this far, something failed, redisplay form
        return View(model);
    }

Answer 1

i did it so:

        var UserManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext()));

        if (UserManager.FindByName("Admin") == null)
        {
            var user = new ApplicationUser() { UserName = "Admin" };
            UserManager.Create(user, "Admin123");
            UserManager.AddToRole(user.Id, "Admin");
        }