Setting different border colors on an arbitrary set of GridView cells

 private void gvLignesFacture_CellFormatting(object sender, CellFormattingEventArgs e)
    {
        // On décore la cellule selon son status
        Point cellCoordinates = new(e.CellElement.RowIndex, e.CellElement.ColumnIndex);
        if (DictOfGvCellStatusByCoordinates.TryGetValue(cellCoordinates, out var lookStatus))
        {
            switch (lookStatus)
            {
                case CtrlLook.Default:
                    e.CellElement.Font = GlobalVars.smallRegularFont;
                    e.CellElement.BorderColor = Color.Black;
                    break;

                case CtrlLook.Valid:
                    e.CellElement.Font = GlobalVars.smallBoldFont;
                    e.CellElement.BorderColor = Color.Green;
                    break;

                case CtrlLook.Incorrect:
                    e.CellElement.Font = GlobalVars.smallRegularFont;
                    e.CellElement.BorderColor = Color.Red;
                    break;
            }
        }
   }