marechai/Marechai/Areas/Identity/Pages/Shared/_LoginPartial.cshtml

@using Marechai.Database.Models
@inject SignInManager<ApplicationUser> SignInManager
@inject UserManager<ApplicationUser> UserManager
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
<ul class="navbar-nav">
    @if(SignInManager.IsSignedIn(User))
    {
        <li class="nav-item">
            <a asp-area="Identity" asp-page="/Account/Manage/Index" class="nav-link text-dark" title="Manage">Hello @User.Identity.Name!</a>
        </li>
        <li class="nav-item">
            <form asp-area="Identity" asp-page="/Account/Logout" asp-route-returnUrl="/" class="form-inline" method="post">
                <button class="btn btn-link nav-link text-dark" type="submit">Logout</button>
            </form>
        </li>
    }
    else
    {
        <li class="nav-item">
            <a asp-area="Identity" asp-page="/Account/Register" class="nav-link text-dark">Register</a>
        </li>
        <li class="nav-item">
            <a asp-area="Identity" asp-page="/Account/Login" class="nav-link text-dark">Login</a>
        </li>
    }
</ul>