TempData.cs

public ViewResult Save(Model modelToSave)
{
	if(ModelState.isValid)
	{
		modelToSave.Save();
		TempData["Message"] = "Saved Successfully";
		// redirects to the list action if the save is successful
		return RedirectToAction("Index");
	}
	//if there are any errors, the same edit View is returned.
	return View("Edit", modelToSave);
}