title: RijndaelManaged supports 128-256 bit key, what key size the default constructor generator?
body: <p>For new RijndaelManaged(), the documentation says it supports keys of 128 bits and up to 256 bits.</p>
  
  <p>When you instantiate new RijndaelManaged(), it creates the Key and IV for you.</p>
  
  <p>What size does it default to, 128 bits?</p>