title: C#: Filtering listbox having List<String> as datasource
body: <p>I have a listbox that has a List assigned as datasource:</p>
  
  <pre><code>List&lt;String&gt; files = new List&lt;String&gt;();   
  files.Add("test");   
  files.Add("test2");   
  ListBox1.DataSource = files;   
  </code></pre>
  
  <p>Now the listbox shows me both entries of the List.</p>
  
  <p>Is there a way to implement an easy filtering mechanism using a textbox?
  So if i enter "2" into the textbox just the "test2" entry should be shown anymore.</p>
  
  <p>Any suggestions?</p>