title: Substring starting at specific character count
body: <p>How would you select the last part of a string starting at a specific character count.
  For example I would like to get all text after the 3rd comma. but I get an error saying
  "StartIndex cannot be less than zero."</p>
  
  <pre><code>Dim testString As String = "part, description, order, get this text, and this text"
  Dim result As String = ""
  result = testString.Substring(testString.IndexOf(",", 0, 3))
  </code></pre>