commandField in detailView control

[talkro]

Hey,

in the website I'm developing, I use a detailView control to view my records. I vreate a custom button to behave as the default Edit/new button of the control for transaction need during the insert or update operation.

When I press on my button, I get an error message saying that:
'Cannot insert null in the column columnName' . However, when I use the default I got no error messag.

I think that the problem is with the parameter collection of the insertCommand or updatecommand but I don't know how to fix the problem.

my code looks like this

open connection
begin transaction 
try
    new Logcommand 
    detailView1.Insert
    logcommand.execute non query
    commit transacation
catch
    echo error
    rollback transaction
finally
    close connection
end try