Issue with Request.IsAuthenticated after Login page mvc asp.net - asp.net-mvc

Question

I am having an issue with checking the authentication when a user logs in to my site. So I have a login page (Login.cshtml), that of course a user would login from. From there the user would be sent to an index page. My issue is that when i hit this
#if (Request.IsAuthenticated)
{
<strong>#Html.Encode(User.Identity.Name)</strong>
}
else
{
<strong>Something went wrong</strong>
}
it fails into the else statement and writes something went wrong. Any advice on how to combat this error would be greatly appreciated. Thank you in advance.
Index.cshtml:
#{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Index</h2>
#if (Request.IsAuthenticated)
{
<strong>#Html.Encode(User.Identity.Name)</strong>
}
else
{
<strong>Something went wrong</strong>
}
My UserContoller(has all the methods for the login):
public ActionResult Index()
{
var user = db.User.Include(u => u.UserName);
var loggedInUser = User.Identity.Name;
return View();
}
[HttpGet]
public ActionResult Login()
{
return View();
}
[HttpPost]
public ActionResult Login(Models.User user)
{
if (ModelState.IsValid)
{
if (isValid(user.UserName, user.Password))
{
FormsAuthentication.SetAuthCookie(user.UserName, false);
return RedirectToAction("Index", "User");
}
else
{
ModelState.AddModelError("", "User Name or Password is incorrect");
}
}
return View(user);
}
private bool isValid(string UserName, string Password)
{
bool isValid = false;
//var user = db.User.SingleOrDefault(u => u.UserName == UserName);
var user = db.User.Where(u => u.UserName == UserName).FirstOrDefault();
var pass = db.User.Where(u => u.Password == Password).FirstOrDefault();
if (user != null && pass != null)
{
isValid = true;
}
return isValid;
}