How to use session in asp net core mvc

* **shopping carts:** remembering items a user adds as they browse.
* **user profiles:** storing user information after login to avoid repeated database queries.
* **wizard workflows:** persisting state as the user progresses through multi-step forms.
* **preferences:** storing user-selected themes, languages, or other display settings.

**1. setting up your project**

**2. enabling session state**

**explanation:**

* **`idletimeout`:** specifies how long a session can be idle before its contents are abandoned. here, it's set to 30 minutes.

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