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[Bobsoftru]

If you don't set list1.SelectedIndex = -1; before repopulating the ObservableCollection, you'll get the error Debug.Assert(!IsSlotOutOfSelectionBounds(slot)); in the SetRowSelection method.

[Bobsoftru]

If you don't set list1.SelectedIndex = -1; before repopulating the ObservableCollection, you'll get the error Debug.Assert(!IsSlotOutOfSelectionBounds(slot)); in the SetRowSelection method. Maybe I should write list1.SelectedIndex = -1; here instead of the error if (OwningGrid.SelectionMode == DataGridSelectionMode.Single)
{
throw DataGridError.DataGridSelectedItemsCollection.CannotChangeSelectedItemsCollectionInSingleMode();
}