ASP.net MVC - Navigation and highlighting the “current” link

Question

When you create a new MVC project it creates a Site.master with the following markup:

    

        <         


        
      

Answer 1

public ActionResult SignIn(User user)
{
    User u = db.Users.Where(p=>p.Email == user.Email & p.Password == user.Password).FirstOrDefault();
    if (u == null)
    {
       return View();
    }
    var id = u.Id;
    Session["id_user"] = id;

    return RedirectToAction("Index", "Home");
}