TempData in asp.net MVC4?

TempData is used for passing the data from controller to controller or from one action to another action. It is a dictionary which is derived from TempDataDictionary. Internally it is using session. Tempdata life is very sort as compared to session because when you read the data from TempData , after that tempdata value has lost. You can preserve the  TempData value using keep and Peek method.

Example:-

public class HomeController : Controller

{

public ActionResult Index()

{

   var model = new Review()

            {

                Body = "Start",

                Rating=5

            };

    TempData["ModelName"] = model;

    return RedirectToAction("About");

}

public ActionResult About()

{    

    var model= TempData["ModelName"];    

    return View(model);

}

}