Best practices for Error Logging in ASP.NET

I was wondering what the best practices for error logging are for a web application developed using asp.net 4.0. This is both at an application level as well as at the page level.
Should we be wrtiting errors to text files or should we be writing errors to database tables. Would like to understand the pros and cons of using each approach. Also if there is something available within the framework that we could use right off the bat.

Any help would be appreciated,
Thanks,
Aditya
giveindiaAsked:
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Jitendra PatilSr.Software EngineerCommented:
hi you can refer the below links
log4net
Error Logging in ASP.NET
Error Handling in .Net with Example
hope this helps.
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nicedoneCommented:
pls also check ELMAH for error logging in asp.net you can integrate it with your website and then it will even send you mails for errors

check out

http://code.google.com/p/elmah/
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sybeCommented:
The issue is quite simple:

database logging only works if the database connection is fine.  So it will not log any connection errors.

textfile logging requires write permissions, which is not always that simple to set. So it will not log any issues with write permissions.

All in all, I prefer textfile logging, because the required permissions are easily checked and every error can be logged.
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