.Net 2.0 includes several controls for authentication...and tracks if the user has already logged in or not. There are some good free tutorials at http://www.asp.net/Tutorials/quickstart.aspx. Click on "Securing Your Application"

>Thanks, but could you please give me a very simple example about how to determine the user already logged in or not? ..sorry I am a beginner for this..
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>Regards
>Teddy
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>PS. Yes, I also like western music, could you please give me exact date / time ? .. good luck