Updating a table using VB.net

[Guest]

Hello i've got a little bit of problem. i wrote a small script that will
update a record using vb.net for the web but i set my table so that whenever
a record is update to autmatically to get the date() and for that i created a
column and assigned it a default value of getdate(). But wheneveri'm updating
that particular field doesnt change.
What should i do?

the getdate() default i used before for an insert statemtn works fine but
for the update it doesnt.
Regards

Dan