ASP.NET MVC: ActionResult LogOn(LoginModel model)

ClientController.cs

using System.Web.Mvc;
using System.Web.Security;

namespace Fox.Studio.SCLogic.Web.Controllers
{
    using Fox.Studio.SCLogic.ModelContext;
    using Fox.Web.Mvc.Models;

    public class ClientController : Controller
    {
        [Authorize]
        public ActionResult Index()
        {
            return View();
        }

        [HttpGet]
        public ActionResult LogOn()
        {
            return View();
        }

        [HttpPost]
        public ActionResult LogOn(LoginModel model)
        {
            if (!ModelState.IsValid)
            {
                ModelState.AddModelError(string.Empty, "Invalid user name or password.");
                return View();
            }

            if (!SCLogicContext.IsUserValid(model.UserName, model.Password))
            {
                ModelState.AddModelError(string.Empty, "Invalid user name or password.");
                return View();
            }

            FormsAuthentication.SetAuthCookie(model.UserName, true);
            return RedirectToAction("index", "client");
        }
    }
}