title: how to append the content to existing file in skydrive using livesdk
body: <p>I am using the below code to upload the content on my phone to a file "SavedContent" on my skydrive.</p>
  
  <pre><code>App.liveConnectClient.UploadAsync("me/SkyDrive", "SavedContent" , fileStream, OverwriteOption.Overwrite);
  
  App.liveConnectClient.UploadCompleted += liveConnectClient_UploadCompleted;
  </code></pre>
  
  <p>Instead of overwriting the existing file I  want to append the new content to above file if the file already exists.</p>
  
  <p>The only way I see it is by downloading the content of the file if already exists and then append the new content and upload the file again with overwrite option.
  How can I do this using the livesdk ?</p>