ASP.Net MVC: Request.IsAuthenticated getting false after successfully login

i am using asp.net MVC and identity to authenticate user. i saw after successfully authenticate

Request.IsAuthenticated returnfalse

this is sample login code which i debug and saw it is working fine.

[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
publicasync Task<ActionResult> Login(LoginViewModel model, string returnUrl)
{
    if (!ModelState.IsValid)
    {
        return View(model);
    }
 
    // This doesn't count login failures towards account lockout
// To enable password failures to trigger account lockout, change to shouldLockout: true
var result = await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, shouldLockout: false);
    switch (result)
    {
        case SignInStatus.Success:
            return RedirectToLocal(returnUrl);
        case SignInStatus.LockedOut:
            return View("Lockout");
        case SignInStatus.RequiresVerification:
            return RedirectToAction("SendCode", new { ReturnUrl = returnUrl, RememberMe = model.RememberMe });
        case SignInStatus.Failure:
        default:
            ModelState.AddModelError("", "Invalid login attempt.");
            return View(model);
    }
}

after successfully login page redirect to home index action where i am showing user information in index view like below way but controls never come there because of Request.IsAuthenticated return false

<div class="row">
    <div class="col-md-12">
        @{
            if (Request.IsAuthenticated)
            {
                var manager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext()));
                var currentUser = manager.FindById(User.Identity.GetUserId());
                <p>@currentUser.UserName</p>

just do not understand what i am missing for which request authenticate method always returning false. please help me to fix it. thanks