jerguero-cs/Pages/New.cshtml

@page
@model NewDefinitionModel
@using Microsoft.AspNetCore.Mvc;
@using Microsoft.AspNetCore.Mvc.RazorPages;
@{
}

<p>New definition :D</p>

@functions {
    public class NewDefinitionModel : PageModel
    {
        public IActionResult OnGet()
        {
            if (User.Identity?.IsAuthenticated != true)
            {
                return RedirectToPage($"/Login", new { redirect = "/New" });
            }

            return Page();
        }
    }
}