if ( listView1.SelectedItems.Count > 0)
                {
                    // 選中行的單元值
                    string s1 = listView1.SelectedItems[0].SubItems[0].Text.ToString();
                    string s2 = listView1.SelectedItems[0].SubItems[1].Text.ToString();
                    // 選中第幾行
                    int a = listView1.SelectedIndices[0];
                }