Reset the datamember as well as the datasource. Set the datamember to a blank string before attaching to a new datasource. It's trying to use the old datamember on a new datasource and will throw ...

Simple update to existing code: If you're using a binding list, the main thing you want to get away from is that array. You're introducing an extra mapping that causes you to lose synchronization.

Let the user know what direction their data is sorted in when using a DataGridView.