title: error when using System.IO.SearchOption.AllDirectories
body: <p>my code </p>
  
  <pre><code> DirectoryInfo[] dirstring = dir.GetDirectories(SearchTextbox.Text, System.IO.SearchOption.AllDirectories);
              FileInfo[] fileinfo = dir.GetFiles(SearchTextbox.Text, System.IO.SearchOption.AllDirectories);
  </code></pre>
  
  <p>dir=@"D:\";
  have a error with expection <code>UnauthorizedAccessException</code>
  How can I catch it and continue search in others folder and files.</p>