call crystal reports value from vb

Hi,

I have a crystal report that I am running from within a vb application. Within that report I have a formula field that calulates a value per page and i want to display the last value in a vb textbox (i later want to update a database with that value).

Is it possible to do this and any pointers? I know how to pass into crystal but not get infomation BACK from the report at runtime.