title: SharePoint : How to check for null with a CAML Query?
body: <p>I have this CAML:</p>
  
  <pre><code>query.Query = @"&lt;Where&gt;&lt;Eq&gt;&lt;FieldRef Name='MessageID' /&gt;&lt;Value Type='Text'&gt;&lt;/Value&gt;&lt;/Eq&gt;&lt;/Where&gt;";
  </code></pre>
  
  <p>This checks if the value of MessageID = string.empty()</p>
  
  <p>What I would like to check for is null.... not empty string...</p>
  
  <p>Is this possible with CAML?</p>