I have a RadGrid with a detail table in it. The detail table uses an objectdatasource which requires 2 parameters. The first parameter gets value from a HiddenField control outside of the grid, and the second parameter is the datakey of the master table of the RadGrid. This structure worked fine always, just found out it stopped working today. I haven't touched this page for ages so there shouldn't be any "new code" that broke this. I have upgraded my telerik controls from 2009 to Q1 2010 version recently. Is it possible that this upgrade caused the problem? Hope somebody has come crose similar issues, thanks.