Concurrency with win forms app and Access

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I am having difficulty performing updates and deletions on an Access database using the Update() method of the OleDBDataAdapter. I can insert rows without a problem, but I get a concurrency exception when trying to update or delete. I am quite sure that no concurrency conflicts actually exist. Is there a reason why the data adapter I am using may have a different row version that the database that it got its data from?

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The minimal code (VB.NET 2003) needed to show this problem is shown below. All I do is loop through the records in the table and update them without making any changes. Out of 600 records, about 40 of them throw Concurrency violation errors in the update, and my GetAllColErrs function provides no output. In comparing the rows that throw errors with those that do not, I could find no pattern. It is obviously a bogus error, as the...

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