changing DataGridView cell border style on DragOver

Question

I'm trying to change the top cell border of a DataGridView cell when I drag something over the cell. What I have compiles, but it's not effecting the cell.

private void dataGridView1_DragOver(object sender, DragEventArgs e)
{
    Point p = dataGridView1.PointToClient(new Point(e.X, e.Y));
    DataGridView.HitTestInfo hit = dataGridView1.HitTest(p.X, p.Y);

    if (hit.ColumnIndex == 0 && hit.Type == DataGridViewHitTestType.Cell)
    {
        e.Effect = DragDropEffects.Move;

        DataGridViewAdvancedBorderStyle styleInput = new DataGridViewAdvancedBorderStyle();
        DataGridViewAdvancedBorderStyle styleTemp = new DataGridViewAdvancedBorderStyle();

        styleInput.Top = DataGridViewAdvancedCellBorderStyle.OutsetDouble;

        dataGridView1[hit.ColumnIndex, hit.RowIndex].AdjustCellBorderStyle(
            styleInput, styleTemp, true, true, true, false);
    }
    else
    {
        e.Effect = DragDropEffects.None;
    }
}