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What is TempData and how is it different from ViewData/ViewBag?

Junior .NET Core
Quick Answer TempData persists for one redirect cycle — you set it before a redirect and read it after. Useful for flash messages ("Record saved!"). ViewData is a dictionary passed from controller to view within one request. ViewBag is dynamic wrapper over ViewData. TempData uses session or cookies behind the scenes; ViewData and ViewBag don't survive redirects.

Answer

ViewData and ViewBag are used to pass data from controllers to views within the same request.

  • ViewData is a Dictionary<string, object>.
  • ViewBag is a dynamic wrapper around ViewData.

TempData persists data across a single redirect and is cleared once read. It is backed by cookies or session and is ideal for messages (e.g., success notifications) that survive a redirect.

S
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