I found that there is a bug in the Reorder List that instead of reading the update parameters of the objectdatasource it uses reflection on the row. This was the cause of the problem as the MM.Net business object adds a bool property HasValues to the row. Once I added a parameter for the HasValues property to my update method it worked.

>I have a ReorderList with an objectdatasource (MM.Net business object). I'm trying to persist the changes to the list but I get a "Reorder failed." alert box with no details.
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>As required, I have an update method in the BO that has parameters that match the fields returned in the select statement. I can see the code hit the objectdatasource updating event, and the updating event args has the right values in its parameter collection. But the breakpoint in BO update code is not hit.
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>Anybody been there, done that?