CellMouseLeave/CellMouseMove เปลี่ยนสี backcolor ใน datagridview

private void dataGridView1_CellMouseLeave(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex != -1)
            {
                dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = Color.White;
                dataGridView1.Rows[e.RowIndex].DefaultCellStyle.ForeColor  = Color.Black ;
            }
        }

        private void dataGridView1_CellMouseMove(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.RowIndex != -1)
            {
                dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = Color.LightGray;
                dataGridView1.Rows[e.RowIndex].DefaultCellStyle.ForeColor = Color.Blue ;
            }
        }

ref: http://greatfriends.biz/webboards/msg.asp?id=67652