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Message: [QUOTE="Guest, post: 9504923"] Um, yes, thanks. Searching for 80070057 *does* return hits - I should have explained a little better, perhaps. It seems that error code 80070057 is somewhat of a generic error code. I've seen it in my own code on occasion in a variety of situations - COM+ problems and other types of data access issues caused by my own foolishness. None of those are applicable in this case as far as I can tell, and indeed, none of the hits on the search you pointed to are relevant to the specific issue I'm experiencing. The most applicable one is "Standard COM Error 80070057. One or more arguments are not valid error." Except that all the arguments *are* valid since the column in question is in the table in question. I threw the 80070057 message in there in the interests of completeness, but I don't think it's the central issue. In fact, when you add the other part of the error message I quoted to your search (the "System.Data" part that I posted) you get 4 hits, none of which match. If we assume that perhaps the error message is being generated by invliad arguments, it begs the question: why are the arguments invalid? - the column *does* belong to the table. -- Thanks; cori [/QUOTE]