title: How to do Data Virtualization for online content in windows phone?
body: <p>I have an app which gets content from internet. those pieces of information are so large and can't fit in memory.</p>
  
  <p><code>LongListSelector</code> does <code>UI Virtualization</code> well. remains <code>Data Virtualization</code>. I thought the solution is to save data in database first then show it.</p>
  
  <p>I have no idea how to do it and these are questions in my head:</p>
  
  <ul>
  <li>Is that how I should do <code>Data Virtualization</code>? </li>
  <li>what happens if there is no enough space. </li>
  <li>any source or tip is appreciated.</li>
  </ul>
  
  <p>thanks.</p>