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MS Access Forms How to detect if data in field has changed

Hello,
Is there a way to check to see if the value of a combo box or text box has changed?  I have placed my code in the AfterUpdate() event of a control but how can I be sure the user actually changed the data?  For example the user may click on the combo box and actually choose the same selection that it was originally.  In this case I wouldn't want to do anything.  Is there an event I can use that is only trigged if the data actually changes?  

Thanks!
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AronMcD
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AronMcD
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Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:

 You shouldn't be in AfterUpdate() if it hasn't changed, but if you want to be sure, look at the .OldValue property, which is the original data that was in the control when the record became current.

JimD.
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AronMcDAuthor Commented:
.OldValue works.  I should have thought of that.  Thanks JDettman!
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