title: add a list into another list in vb.net
body: <p>I have a list as follows and I want to add it in another list:</p>
  
  <pre><code>Dim listRecord As New List(Of String)
  listRecord.Add(txtRating.Text)
  listRecord.Add(txtAge.Text)
  listRace.Add(listRecord)  
  </code></pre>
  
  <p>to obtain something like <code>{{r1,a1},{r2,a2},{r3,a3}}</code>, how can I achieve this in VB.Net?</p>