title: Concatenate string properties of an object with lambda
body: <p>Please consider the following:</p>
  
  <pre><code>public class MyObject
  {
     public bool B;
     public string Txt;
  }
  
  List&lt;MyObject&gt; list; //list of a bunch of MyObject's 
  </code></pre>
  
  <p>With lambda expression, how can I produce a string consisting of comma separated values of Txt of those objects, where B is true?</p>
  
  <p>Thank you.</p>