title: SSRS counting null values
body: <p>How can I count the number of null values using SSRS? The following expression is not working:</p>
  
  <pre><code>= Count(IsNothing(Feilds!.FieldName.Value))
  </code></pre>
  
  <p>This also isn't working:</p>
  
  <pre><code>= Count(Feilds!.FieldName.Value Is Nothing)
  </code></pre>