title: get the value of a listview subitem
body: <p>I have a code in C#. I have a listview then what I want is to get the value of the subitem specifically the Subtotal subitem which contains the subtotal price of the orders. I want to sum up the values and display to result to a textbox in the same form. How can I do that? Here's my code:</p>
  
  <pre><code>AddOrderForm add = new AddOrderForm();
          foreach (DataRow drow in dt.Rows)
          {
              add.nametb.Text = drow["Menu"].ToString();
              add.Pricetb.Text = drow["MenuPrice"].ToString();
              add.listBox1.Items.Add(drow["MenuDesc"].ToString());
              add.orderqtytb.Focus();
              add.ShowDialog();                
          }
          if (add.isAddOrder)
          {
  
              ListViewItem item = new ListViewItem();
              item.Text = add.nametb.Text;
              item.SubItems.Add(add.orderqtytb.Text);
              item.SubItems.Add(add.Pricetb.Text);              
  
              double total = 0;
              try
              {
                  total = double.Parse(add.Pricetb.Text) * double.Parse(add.orderqtytb.Text);
              }
              catch
              {
                  total = 0;
              }
              item.SubItems.Add(total.ToString("0.00"));
              Listview.Items.Add(item);
  </code></pre>