Exception error when authenticating login with null values - Simplemembership - ASPNET MVC

Question

I developed a project on Asp.net mvc5 of a course I’m doing, which is accusing the following error of exception when authenticating the login menu when I enter no data in the form fields and step null parameters:

"An Exception of type 'System.Argumentexception' occurred in Webmatrix.WebData.dll but was not handled in user code - Additional information: Value cannot be null or an Empty string"

I believe that the problem is with simplemembership, because in the other views of forms when I authenticate with null values does not happen this error of exception, being that the controller of the login menu was configured with simplemenbership. I would like to know how to configure simplemembership not to give this exception error when authenticating with null values. Below is the screen print and logincontroller code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using WebMatrix.WebData;

namespace Financas.Controllers
{
    public class LoginController : Controller
    {
        // GET: Login
        public ActionResult Index()
        {
            return View();
        }
        public ActionResult Autentica(string login, string senha )
        {
               if (WebSecurity.Login(login, senha))
            {
                return RedirectToAction("Index", "Movimentacao");
            }
               else
            {

                ModelState.AddModelError("Login.Invalido", "Login ou senha incorretos");
                return View("Index");
            }
            }
        public ActionResult Logout()
        {
            WebSecurity.Logout();
            return RedirectToAction("Index");

            

        }
    }
}

Answer 1

Well, as the message says, this method does not accept null values or empty strings. In this case you would have to directly validate your values in this way:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using WebMatrix.WebData;

namespace Financas.Controllers
{
    public class LoginController : Controller
    {
        // GET: Login
        public ActionResult Index()
        {
            return View();
        }
        public ActionResult Autentica(string login, string senha )
        {
             if(String.IsNullOrEmpty(login) || String.IsNullOrEmpty(senha)
            {
                ModelState.AddModelError("Login.PreencherTodosCampos", "Por favor, preencha todos os campos.");
                return View("Index");
            }


             if (WebSecurity.Login(login, senha))
            {
                return RedirectToAction("Index", "Movimentacao");
            }
               else
            {

                ModelState.AddModelError("Login.Invalido", "Login ou senha incorretos");
                return View("Index");
            }
            }
        public ActionResult Logout()
        {
            WebSecurity.Logout();
            return RedirectToAction("Index");



        }
    }
}

I hope I’ve helped.

Hug.