title: How to initialize an array of ObservableCollection?
body: <p>Im designing an UWP movie app and i need several ObservableCollections to store different movie lists. I wanna use ObservableCollection[Index], but dont know how to initialize it.
  I've tried the following code but failed:</p>
  
  <pre><code>public static ObservableCollection&lt;Subject&gt;[] FullMovieList = new ObservableCollection&lt;Subject&gt;[6];    
  </code></pre>
  
  <p>How can i accomplish it? Thx~</p>