title: Finding which encodings in .NET are ASCII-compatible
body: <p>Is there actually any simple method of finding which encodings in .NET are ASCII-compatible? </p>
  
  <p>(Based on the question posed in <a href="https://stackoverflow.com/questions/17619279/extended-ascii-in-c-sharp#comment65426360_17619482">Nyerguds's comment</a>.)</p>