title: MySql.Data c# .net library which runtime should I use?
body: <p>When adding reference to the <a href="http://dev.mysql.com/downloads/connector/net" rel="nofollow">MySQL .NET connector</a> I am seeing two entries listed for <code>MySql.Data</code></p>
  
  <p>one with a runtime version of 4.0.30319 and another with a runtime version of 2.0.50727</p>
  
  <p>Which should I reference? does it make a difference?</p>