如何更改ComboBox的选定项目的ForeColor？

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    ComboBox comboBox = (ComboBox)sender;
    comboBox.ForeColor = Color.Red;
}

private void comboBox1_DrawItem(object sender, DrawItemEventArgs e)
{
    ComboBox comboBox = (ComboBox)sender;
    if (e.Index >= 0)
    {
        e.DrawBackground();
        Brush brush = Brushes.Black;
        if (comboBox.SelectedIndex == e.Index)
        {
            brush = Brushes.Red;
        }
        e.Graphics.DrawString(comboBox.Items[e.Index].ToString(), e.Font, brush, e.Bounds);
        e.DrawFocusRectangle();
    }
}