title: IList trouble. Fixed size?
body: <p>I have this code :</p>
  
  <pre><code>IList&lt;string&gt; stelle = stelleString.Split('-');
  
  if (stelle.Contains("3"))
      stelle.Add("8");
  
  if (stelle.Contains("4"))
      stelle.Add("6");
  </code></pre>
  
  <p>but seems that IList have a fixed size after a .Split() : <em>System.NotSupportedException: Collection was of a fixed size.</em></p>
  
  <p>How can I fix this problem?</p>