title: String.Insert not working
body: <p>I have (hopefully) a simple problem.</p>
  
  <pre><code>String.Insert(0, "test");
  </code></pre>
  
  <p>is not working, yet:</p>
  
  <pre><code>String.Text += "test";
  </code></pre>
  
  <p>does..? I need Insert so I can insert something in the middle of a string.</p>