title: .NET BindingSource Filter syntax reference
body: <p>You can use the Filter property of a BindingSource to do SQL like filtering.
  For example:</p>
  
  <pre><code>bindingSource.Filter= "Activated = 1"
  </code></pre>
  
  <p><strong>Is there something like documentation on the exact syntax of this?</strong></p>
  
  <p>I would like to check if a field is not DBNull, so i tried "Field != NULL" but it gives a syntax error.</p>