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I am building a large application and I ususally use a simple session to store private global information however as the application could be rather large I belive this could be a problem due to the amount of memory sessions it could have.
Is there a better way to store such variables?
For example, when the user logs in I want to store data about that user and display it where needed without having to query the database each time.
Sessions are the way to go here, they are intended to persist information about the current session across requests. There is no other object in the ASP.NET framework that has this intention.
You could use the Cache, or store in the Application collection, but then the responsibility of uniquely identifying the individual session data is up to you.
What’s also up to you is handling when the session terminates, and freeing up the instances that are stored in those collections (Cache or Application).
It’s really a bad idea to start to ask these questions based on what you might ‘think’ will happen. This is a form of premature optimization, and you should avoid it. Rather, use Sessions, as they were intended for this purpose, then measure where your bottlenecks are and address them, should performance be an issue when testing.