title: Get unique items from multiple lists using LINQ- C#
body: <p>I have 3 lists.</p>
  
  <pre><code>ListA&lt;items&gt;
  ListB&lt;items&gt;
  ListC&lt;items&gt;
  </code></pre>
  
  <p>I have to select one item from each list but the item.itemID should be unique for each of those items. How can i achieve this? Thanks in advance.</p>