title: Filter ObservableCollection
body: <p>I am very new to coding and am trying to learn to code for Windows phone. I am stuck at a problem since the last week and it is driving me crazy.</p>
  
  <p>I have an <code>ObservableCollection</code> defined like this:</p>
  
  <pre><code>public ObservableCollection&lt;Note&gt; Items { get; private set; }
  </code></pre>
  
  <p>The <code>Note</code> class has two variables in it called <code>Index</code> and <code>Category</code>.</p>
  
  <p>I want to filter the <code>ObservableCollection</code> so that I can choose a particular element from it.</p>
  
  <p>Is there a simple way doing this? Any help would be highly appreciated!</p>