title: How can I send an invitation request using the Facebook API?
body: <p>I would like to send an invitation request from my Facebook application written in C#.</p>
  
  <p>Here is what I tried:</p>
  
  <pre><code>_fbService.API.notifications.sendEmail(DataList1.DataKeys[e.Item.ItemIndex].ToString(),"Invitation to play a game", "You are invited to play the game","");
  </code></pre>
  
  <p>This does not work, it only sends a notification, not a request.<br>
  What am I doing wrong?</p>