User Activity Log Files

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SQL-Server-2005

C#3.0

.NET3.5

C#

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I am working on an web base application.
I am using VS 2008 and SQL server 2005.

client want the information about the logged in user .(This i have done with help of session).But Below are the thing for which i need help or suggestion.

The client want the information about the activity perform by Logged in user after his success full loggedin Like if he updated any record or view or deleted how much time he spend on the website.and the URL of the pages and show this information in grid view or in any way so that he can have record of who has up dated which record .


I have just started my career .
I dont have any knowledge that how to achieve this task .

Please any one can suggest me how to do this.
I would be very thank full to him and my job will be safe .

Please help me

Thanks in advance