title: How to check in NAnt script whether property is set or not?
body: <p>Hi I am create a release script using NAnt. How can I check a variable value is getting or not.</p>
  
  <p>Now I call my script like this</p>
  
  <pre>
  
      nant -buildfile:CreateNew.build -D:name="Test.V.1.0" -D:bIDs="2" -D:uIDs="'3'" 
  
  </pre>
  
  <p>Some times I will not pass uIDs.</p>
  
  <p>So I need to check in my nant script whether the uIDs is getting or not. How can I do that?</p>