Alert message after log in using jquery

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C#

MVC

jQuery

I am having a login page when user log in i have to show Successful login.I am using MVC and jquery but my alert message was popping up before validation.I want to show the message after the username and pwd are validated.

<script>

    $('#btsubmit').click(function () {

       
        alert("Logged in");
    });
</script>

<input type="submit" id="btsubmit" value="Log in" />

[ValidateAntiForgeryToken]
       public ActionResult Login(LoginModel model, string returnUrl)
       {
           if (ModelState.IsValid && WebSecurity.Login(model.UserName, model.Password, persistCookie: model.RememberMe))
           {

               return RedirectToLocal(returnUrl);
           }

           // If we got this far, something failed, redisplay form
           ModelState.AddModelError("", "The user name or password provided is incorrect.");
           return View(model);
       }