title: c# and Encoding.ASCII.GetString
body: <pre><code>byte[] header = new byte[]{255, 216}; 
  
  string ascii =  Encoding.ASCII.GetString(header);
  </code></pre>
  
  <p>I expect ASCII to be equal to be  FFD8 (JPEG SOI marker)</p>
  
  <p>Instead I get "????"</p>