C#

Hi guyss, I have a listview that loads the data of the Menu table in the database (MsSql 2012). The table has four columns ID, Product, Price and Quantity. So i am trying to make the rows of each items in the listview that will go red if the quantity in the database is 0. I've set the quantities of each Products so that i can identify if it will work.Apparently this is my code right now, but nothing happens when i put the method redRowL in the Form1_Load.

Note: The listview only loads the ID, Product and Price.

public void redRowL()
       {


           try
           {
       foreach(ListViewItem item in listView2.Items)
         {
                       SqlConnection cn = new SqlConnection();
                   con.Open();
                   string qwe = "Select " +  item.SubItems[0].Text  + " from Menu where Quantity = 0";



                    SqlCommand cmd = new SqlCommand(qwe, con);
                   dr = cmd.ExecuteReader();
                   while (dr.Read())
                   {
                         item.BackColor = Color.Red;
                   }
         }
           }
           catch
           {
               MessageBox.Show("Rows are Red , Your eye is Blue, What will yo do if im inlove with you?", "PHugOts Error");

           }
           con.Close();
       }

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