title: How to check if a string array is null?
body: <p>I modified a workflow in TFS template, in the head of this workflow I initialized an array of string named <code>NextChainBuildDefinition</code>. After a few steps, I tried to check if this array is null or not.</p>
  
  <p>I did this way:</p>
  
  <pre><code>String.IsNullOrEmpty(CStr(NextChainBuildDefinition.Count))
  </code></pre>
  
  <p>After this I see error: <code>Exception Message: Value cannot be null.</code> Therefore <code>NextChainBuildDefinition</code> is null, and in that step it throws an exception. </p>
  
  <p>How do I check if this string array is null?</p>