title: What's the Best Way to Add One Item to an IEnumerable<T>?
body: <p>Here's how I would add one item to an IEnumerable object:</p>
  
  <pre><code>//Some IEnumerable&lt;T&gt; object
  IEnumerable&lt;string&gt; arr = new string[] { "ABC", "DEF", "GHI" };
  
  //Add one item
  arr = arr.Concat(new string[] { "JKL" });
  </code></pre>
  
  <p>This is awkward.  I don't see a method called something like <code>ConcatSingle()</code> however.</p>
  
  <p>Is there a cleaner way to add a single item to an IEnumerable object?</p>