title: Find items from a list which exist in another list
body: <p>I have a <code>List&lt;PropA&gt;</code></p>
  
  <pre><code>PropA  
  {  
      int a;  
      int b;  
  }
  </code></pre>
  
  <p>and another <code>List&lt;PropX&gt;</code></p>
  
  <pre><code>PropX  
  {  
      int a;  
      int b;  
  }
  </code></pre>
  
  <p>Now i have to find items from <code>List&lt;PropX&gt;</code> which exist in <code>List&lt;PropA&gt;</code> matching <strong>b</strong> property using lambda or LINQ.</p>