Should I be passing values through RedirectToAction or TempData?

Question

I\'ve seen some articles (even MSDN) suggest TempData for passing data between ActionMethods. But I\'ve seen others here say that TempData should be avoided. What\'s the bes

Answer 1

I came up with this. Is this bad, good, should be improved upon?

RAZOR/HTML:

        @using (Html.BeginForm("Previous", "Home", new{ year = @year, month = @month },  FormMethod.Post)) 
        {
            
        }
               
        @using (Html.BeginForm("Next", "Home", new { year = @year, month = @month }, FormMethod.Post))
        {
            
        }
    

Controller/Action Methods:

public ActionResult Index(int? year = 2012 , int? month = 2)
        {
            ViewBag.Message = "Welcome to ASP.NET MVC!";

            Calendar monthEventsCal = new Calendar();

            HTMLMVCCalendar.Models.MonthModel allMonthEvents = monthEventsCal.monthEvents(year.Value, month.Value);
            return View("Index", allMonthEvents);
        }

        [HttpPost]
        public ActionResult Previous(int? year = 2012, int? month = 2)
        {
            Calendar monthEventsCal = new Calendar();

            var newMonth = monthEventsCal.previousMonth(year.Value, month.Value);

            int currMonth = newMonth.Item2;
            int currYear = newMonth.Item1;

            return RedirectToAction("Index", "Home", new { month = currMonth, year = currYear });
        }

        [HttpPost]
        public ActionResult Next(int? year = 2012, int? month = 2)
        {
            Calendar monthEventsCal = new Calendar();

            var newMonth = monthEventsCal.nextMonth(year.Value, month.Value);

            int currMonth = newMonth.Item2;
            int currYear = newMonth.Item1;

            return RedirectToAction("Index", "Home", new { month = currMonth, year = currYear });
        }

Global.asax.cs:

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

            routes.MapRoute(
                "Default", // Route name
                "{controller}/{action}/{month}/{year}", // URL with parameters
                new { controller = "Home", action = "Index", month = UrlParameter.Optional, year = UrlParameter.Optional } // Parameter defaults
                //"{controller}/{action}/{id}", // URL with parameters
                //new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
            );

        }