title: How to add an item in a collection using Linq and C#
body: <p>I have a collection of objects. e.g.</p>
  
  <pre><code>List&lt;Subscription&gt; subscription = new List&lt;Subscription&gt;
  {
      new Subscription{ Type = "Trial", Type = "Offline", Period = 30  },
      new Subscription{ Type = "Free",  Type = "Offline", Period = 90  },
      new Subscription{ Type = "Paid",  Type = "Online",  Period = 365 }
  };
  </code></pre>
  
  <p>Now I want to add one more item in this list using LINQ. How can I do this?</p>