Multi Column Search In ListView ( C# ,Visual Studio 2015 )

Question

HI , I am using this code on OnKeyPress event , which filters my list View, but it only searches in the 1st Column of the List View .. Need Help ..

for (int i = lv_panel_products.Items.Count - 1; i >= 0; i--)
{
    ListViewItem lvi = lv_panel_products.Items[i];
    foreach (ListViewItem.ListViewSubItem subitem in lv_panel_products.Items)
    {
        if (lvi.Text.ToLower().Contains(txt_searchproducts.Text.ToLower()) || subitem.Text.ToLower().Contains(txt_searchproducts.Text.ToLower()))
        {
            lvi.BackColor = Color.Black;
        }
        else
        {
            lv_panel_products.Items.Remove(lvi);
        }
    }
}