This c# code shows you how you coloring every second row in a ListView:

int i = 0;
foreach (ListViewItem item in listView1.Items)
{
    if (i++ % 2 == 1)
    {
        item.BackColor = Color.LightGray;
        item.ForeColor = Color.BlueViolet;
        item.UseItemStyleForSubItems = true;
    }
}

listview