Can I change source code with a Pre-build event?

[wild_bill]

I've got a variable, BuildDateTimeStamp, would it be possible to add a pre build event to update the value of this variable?

 Dim BuildDateTimeStamp = #4/12/2011 10:29:19 AM#

Then if I rebuilt in a couple minutes, it would automatically change to

 Dim BuildDateTimeStamp = #4/12/2011 10:35:23AM#

I have seen examples of people getting the build date from the version, but on this assembly the version is a static value that does not often change.