title: Many to many object to object relation in C#
body: <p>I am working on a small educational project to exercise perst.net.</p>
  
  <p>We have a tiny design problem, that is how to best resolve the relation between two classes of objects, that is the <em>participant</em> and <em>championship</em>. It is a many to many relation as <em>participant</em> can take part in many <em>championships</em> and <em>championships</em> can have a multiple <em>participants</em>.</p>
  
  <p>Please advise how to do this best in C#, should I use the 'relational DB like' technical class?</p>