I need help with the control source in a form

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  • Start date Start date
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Guest

The name of a text box in a form is FreightCharge and the Control Source is
=[order subtotal]*[PurchaseOrderNumber]/100 . This formula works fine and
displayes it correctly but I need the displayed data to be saved in the
FreightCharge field of a table. Please help I can't get this to work. Thanks
 
The name of a text box in a form is FreightCharge and the Control Source is
=[order subtotal]*[PurchaseOrderNumber]/100 . This formula works fine and
displayes it correctly but I need the displayed data to be saved in the
FreightCharge field of a table. Please help I can't get this to work. Thanks
Click to expand...



John W. Vinson[MVP]
Join the online Access Chats
Tuesday 11am EDT - Thursday 3:30pm EDT
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The name of a text box in a form is FreightCharge and the Control Source is
=[order subtotal]*[PurchaseOrderNumber]/100 . This formula works fine and
displayes it correctly but I need the displayed data to be saved in the
FreightCharge field of a table. Please help I can't get this to work. Thanks
Click to expand...

Storing derived data such as this in your table accomplishes
three things: it wastes disk space; it wastes time (almost
any calculation will be MUCH faster than a disk fetch); and
most importantly, it risks data corruption. If one of the
underlying fields is subsequently edited, you will have data
in your table WHICH IS WRONG, and no automatic way to detect
that fact.

Just redo the calculation whenever you need it, either as a
calculated field in a Query or just as you're now doing it -
in the control source of a Form or a Report textbox.

John W. Vinson[MVP]
Join the online Access Chats
Tuesday 11am EDT - Thursday 3:30pm EDT
http://community.compuserve.com/msdevapps
 
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