// POST: administration
[HttpPost]
public ActionResult Login(Admin admin)
{
    var user = AdminContext.admins.SingleOrDefault(u => u.Email == admin.Email && u.Pass == admin.Pass);

    if (user != null)
    {
        Session["adminID"] = user.adminID;
        Session["adminNom"] = user.Nom.ToString() + " " + user.Prenom.ToString();

        if (System.IO.File.Exists(Server.MapPath("~" + user.Photo)))
        { Session["adminPhoto"] = "~" + user.Photo; }
        else
        { Session["adminPhoto"] = "~/Content/TemplateAdmin/assets/images/no_img.png"; }

        return RedirectToRoute("Dashboard");
    }
    else
    {
        ModelState.AddModelError("", "Email ou mot de passeest incorrect");
        return View("~/Views/Administration/Login.cshtml");
    }
}

public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
            name: "LoginAdmin",
            url: "administration",
            defaults: new { controller = "Admin", action = "Login" }
            );

            routes.MapRoute(
            name: "Dashboard",
            url: "administration/dashboard",
            defaults: new { controller = "Dashboard", action = "Index"}
            );

            routes.MapRoute(
            name: "Profile",
            url: "administration/profile",
            defaults: new { controller = "Admin", action = "Profil" }
            );

            routes.MapRoute(
            name: "Gestion_admins",
            url: "administration/gestion_admins/{action}/{id}",
            defaults: new { controller = "Admin", action = "Index", id = UrlParameter.Optional }
            );
}