title: Difference between "List<int>[,]" and "List<List<int>>"
body: <p>Whats the difference between <code>List&lt;int&gt;[,]</code> and <code>List&lt;List&lt;int&gt;&gt;"</code> in C#? </p>
  
  <p>I know that the call is different and to access the positions too, but the purpose is the same?</p>
  
  <p>I've seen twice implementations that had the same result and that these two forms were implemented.</p>