When to use TempData vs Session in ASP.Net MVC?

TempData is session, so they're not entirely different. However, the distinction is easy to understand, because TempData is for redirects, and redirects only . So when you set some message in TempData and then redirect, you are using TempData correctly.

The default TempData provider uses the session so there really isn't much of a distinction, except that your TempData is cleared out at the end of the next request. You should use TempData when the data needs only to persist between two requests, preferably the second one being a redirect to avoid issues with other requests from the user -- from AJAX, for example -- deleting the data accidentally. If the data needs to persist longer than that, you should either repopulate the TempData or use the Session directly.

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