>>Do you know the syntax for this?
>>

>>SqlDataSource2.UpdateParameters.Add("DateCompleted", Now())
>>

>>
>This is the quick sample I can find
>
>http://forums.asp.net/p/1353133/2768797.aspx#2768797
>
>I have the code and I posted it on that forum, but I have limited time now to search for better samples.
>
>Hopefully it would be enough for you to adapt for Updating event.

BTW, if you want to do this on the database level, see

Last Updated User Thread #988451 (thanks Greg for recent reminder)