TempData Vs Session in ASP .NET MVC:

👉🏻TempData

✅TempData allow us to persisting data for the duration of single subsequent request.
✅ASP. net MVC will automatically expire the value of tempdata once consecutive request returned the result (it means, it alive only till the target view is fully loaded).
✅It valid for only current and subsequent request only
✅TempData has Keep method to retention the value of TempData.

Example:

TempData.Keep(), TempData.Keep(“EmpName”)

✅TempData internally stored the value in to Session variable.

✅It is used to stored only one time messages like validation messages, error messages etc.

👉🏻Session:

⚡️Session is able to store data much more long time, until user session is not expire.
⚡️Session will be expire after the session time out occurred.
⚡️It valid for all requests.
⚡️N/A
⚡️Session variable are stored in SessionStateItemCollection object (Which is exposed through the HttpContext.Session property of page).
⚡️It is used to stored long life data like user id, role id etc. which required throughout user session.
⚡️TempData and session, both required typecasting for getting data and check for null values to avoid run time exception.