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How do I undo a field on a form using VBA?

Hi experts,

I have a form called "Setup" and fields on the form.  One of these fields is called "DateFormat".  It is a combo box.  The format is either DD/MM/YYYY or MM/DD/YYYY.  When the user selects one of these options, and then clicks the "save" button, a msgbox pops up that states that the system needs to log off for these changes to take effect. Do you want to do this now? Yes/No.  

If the user selects "Yes" the system logs off with no problems.

If the user selects "No" then I need the DateFormat field to undo the last selection.  So if prior to selecting something from the DateFormat field the data showed "DD/MM/YYYY" and now the user has changed that to "MM/DD/YYYY", I would like to undo the last change and revert back to "DD/MM/YYYY".  I have tried the attached code in the "No" button of the msgbox, but nothing is working. Can anybody help?

Thank you.


Forms![Setup]![DateFormat] = Forms![Setup]![DateFormat].OldValue

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Microsoft Access

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8/22/2022 - Mon
Rey Obrero (Capricorn1)

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Cap - as always - your solution was perfect.

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