Recordset Locking ?

I have a multi-user vb application with SQL server. I use server-side curson and lock type is adLockPessimistic. So only one user can edit the record at a time.
But I don't know if another user tried to edit the locked record, what's going to be happened? An error or something else?

Thanks

it should throw an error that the record is locked.. you would just have to trap the error and handle it