In this scenario, the RadGridView.DataSource property is set to Microsoft.EntityFrameworkCore.ChangeTracking.ObservableCollectionListSource. When the RadGridView.Rows.Remove() method is called an IndexOutOfRange exception is thrown.
Hello Al Wilton,
Thank you for reporting this. As a workaroun, if possible, you can try using a different collection as a DataSource instead of ObservableCollectionListSource.
Regards,
Dinko | Tech Support Engineer
Progress Telerik