Login and Logout Links

_logout.cshtml

@if (User.Identity.IsAuthenticated)
{
    <li class="nav-item">
        <span class="navbar-text text-dark">Hello @User.Identity.Name!</span>
    </li>
    <li class="nav-item">
        <a class="nav-link text-dark" asp-area="MicrosoftIdentity" 
           asp-controller="Account" asp-action="SignOut">
             Sign out
        </a>
    </li>
}
else
{
    <li class="nav-item">
        <a class="nav-link text-dark" asp-area="MicrosoftIdentity" 
           asp-controller="Account" asp-action="SignIn">
              Sign in
        </a>
    </li>
}