title: C#: How to add subitems in ListView
body: <p>Creating an item(Under the key) is easy,but how to add subitems(Value)?</p>
  
  <pre><code>listView1.Columns.Add("Key");
  listView1.Columns.Add("Value");
  listView1.Items.Add("sdasdasdasd");
  //How to add "asdasdasd" under value?
  </code></pre>