How to keep my session , Until unless I click clear session link?

[chakran]

Hi, am developed website. In that user logged in and next he go to other sites ex, google.com and he come back to previous page meam login page, then the system asks user to login again. how to maintain session values until unless user click clear session link? Why is it that some sites know that user was logged in already while mine is not? Can anyone tell me what are the modification I have to do..? I used C#,asp.net 2.0.

[Christian Graus]

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