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I'd prefer comparing the changed values to the actual values in the file, not the stored ones in any state holder or hidden fields. That would make more sense in a generic way.
How do you know that the actual values in the file haven't been changed by another user? If you truly do want a read next changed operation, the only real way to know is to compare to a saved copy of the data. It could be in some kind of session object, or you could have the client return the before and after versions of the data, but I don't think you could compare to the data file, as in 'Chain to the file to see if the record is different. If so, post these differences as changes" Regards, Rich
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