Login mechanism for web apps

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I am writing a generic login mechanism for our web apps using ASP.NET / C#
(VS2005). Various web pages need to present a login dialogue for the user to
re-enter their application-level username & password every 20 minutes. The
dialogue would pop up, the user would enter their login details again and
they would return to where they were previously in the web app. This
dialogue would be displayed (if necessary) on page load. Ideally the login
dialogue will be a popup. Authentication will require access to a database.

Is there an easy way to implement this so that only minimal changes are
needed to web pages for them to use this mechanism? I want to avoid having
the same code in every web page that needs to use the mechanism. Is there
any way to share this code, possibly in a C# dll?


.

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