title: find if an integer exists in a list of integers
body: <p>i have this code:</p>
  
  <pre><code>  List&lt;T&gt; apps = getApps();
  
          List&lt;int&gt; ids;
  
          List&lt;SelectListItem&gt; dropdown = apps.ConvertAll(c =&gt; new SelectListItem
          {
              Selected = ids.Contains(c.Id),
              Text = c.Name,
              Value = c.Id.ToString()
          }).ToList();
  
  
  ids.Contains
  </code></pre>
  
  <p>seems to always return false even though the numbers do match</p>
  
  <p>any ideas?</p>