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How to log exactly what user has changed in Gridview event ?

Posted By:      Posted Date: October 12, 2010    Points: 0   Category :ASP.Net

I have Gridview which allows user to edit record.
I already build the event to save the new record, time and user machine information to a log database.
However, this means a whole record is saved to the log... if the user just change one or two column/field out of say 20 fields, then there is a lot of waste. Also the change is not obvious.

How can I log exactly which field(s) was changed in the record ?

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