DataAdapter.Update not working

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VB.NET
Why can't I update a database table using a dataadapter.update method? I get a concurrency failure message - this is false, there is no other process accessing the database. If I write my own SQL update command and use the dataadapter.updatecommand.executenonquery method it works fine. I ma using OLEDBdatadapter etc and an Access database.

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The concurrency failure exception is raised when no rows are affected, which typically means that another user changed the row between the time it was read and the time that the update method was called, but could also mean that there was another reason that the row was not updated. Were you using SQL Server, I would suggest using profiler to trace the update. I’m not sure how you’d trace the update using Access, since most of my experience with ADO.NET involves SQL Server.

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