如何更改DataGridView行的背景颜色并在悬停时撤消？

dataGridView1.CellFormatting += new DataGridViewCellFormattingEventHandler(dataGridView1_CellFormatting);

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    if (dataGridView1.Columns[e.ColumnIndex].Name == "ColumnName" && e.RowIndex >= 0)
    {
        if (dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString() == "特定值")
        {
            dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = Color.Red;
        }
        else
        {
            // 恢复默认背景颜色
            dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = dataGridView1.DefaultCellStyle.BackColor;
        }
    }
}

private Color defaultRowColor;

private void dataGridView1_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
{
    if (e.RowIndex >= 0)
    {
        defaultRowColor = dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor;
        dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = Color.LightGray;
    }
}

private void dataGridView1_CellMouseLeave(object sender, DataGridViewCellEventArgs e)
{
    if (e.RowIndex >= 0)
    {
        dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = defaultRowColor;
    }
}

dataGridView1.CellMouseEnter += new DataGridViewCellEventHandler(dataGridView1_CellMouseEnter);
dataGridView1.CellMouseLeave += new DataGridViewCellEventHandler(dataGridView1_CellMouseLeave);