Meaning if I get an update for stock XYZ I no longer know where in the BindingList to update it - Item 0 can become Item 5 after the sort. How do I quickly search through a BindingList of objects ...

Are you rebinding after you clear/change the data sources, as if you dont do that, the old data will still be bound.<BR><BR>Edit - I dont think you even need to set your datasource to nothing ...