Open default browser from listView Subitem click
string[] row1 = { username, "Start", proxy, "0", "0" };

                ListViewItem item = new ListViewItem();

                item.Text = numeret.ToString();
                item.Tag = numeret;
                listView1.Items.Add(item).SubItems.AddRange(row1);

ProcessStartInfo sInfo = new ProcessStartInfo("http://mysite.com/");
Process.Start(sInfo);