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I read here that an inproc asp.net session resets it’s timeout everytime it is accessed (read or write). My question is, if the timeout is also reset if I only read the sessionID?
Example: Session timeout is set to 20 min. After 15 min. of inactivity I load a page and read the Session.SessionID. Will the session still exist after 10 more min.?
And one more question: Does it matter if the page is loaded directly or accesses via AJAX?
It appears to me that you are mixing up two different things: Reading a value from Session state (in code) differs from attaching an instance of SessionState to the current Request.
Unless I am very much mistaken, the timeout is not refreshed whenever you access a Session object (again, in code), rather it is refreshed when a new request is served. This happens because the SessionState item is itself added to the Cache (and expiration policy is set)
So, to answer your question: The timeout will not be reset.
To elaborate on the example you gave: The timeout will be reset on the load of the page, rather than when you read the SessionID in code.