Hi Thomas,

Thank you very much for the provided project.

I can confirm that I was able to replicate the exception and this does seem like a bug at our end. I have thus converted this support thread to a bug report in which you can follow its status. I've also gone ahead and awarded you some Telerik points for bringing this to our attention.

As this issue seems to be caused by the control's selection mechanism, what I can suggest at this point as a workaround is to first clear the selection before removing the column and then reassigning it. Here's what I have in mind:

            var gridView = (RadGridView)sender;
            gridView.Columns[1].DisplayIndex = 2;
            gridView.Columns[2].DisplayIndex = 1;

            gridView.SelectAll();

            var selectedItems = new ObservableCollection<object>();
            foreach (var item in gridView.SelectedItems)
            {
                selectedItems.Add(item);
            }

            gridView.SelectedItems.Clear();
            var firstColumn = gridView.Columns[0];
            gridView.Columns.Remove(firstColumn);

            foreach (var item in selectedItems)
            {
                gridView.SelectedItems.Add(item);
            }

You can extract this in a separate method that accepts the index of the column to remove as a parameter.

I do hope you find such an approach applicable for the time being.

Regards,
Dilyan Traykov
Progress Telerik