title: Add property to list of a class
body: <p>I have a List of a OrdersInfo
  I inherit OrdersInfo into YearlyResourceReport and add 12 properties - months (public string Jan {get;set;}) etc</p>
  
  <p>Now i create a list of the new class (So [OldProperties] + [12Month])</p>
  
  <p>How can i merge the two lists together?</p>
  
  <pre><code>class YearlyResourceReport : OrdersInfo
  {
      public string Jan { get; set; }
      public string Feb { get; set; }
      public string Mar { get; set; }
      public string Apr { get; set; }
      public string Jun { get; set; }
      public string Jul { get; set; }
      public string Aug { get; set; }
      public string Sep { get; set; }
      public string Oct { get; set; }
      public string Nov { get; set; }
      public string Dec { get; set; }
  
  }
  </code></pre>
  
  <p>Addition:</p>
  
  <pre><code>List&lt;OrdersInfo&gt; ordersList = 
  WorkOrderEntity.GetYearlyOrders(year, loggedInUser, customerIds, sortBy).ToList();
  
  List&lt;YearlyResourceReport&gt; newList;
  </code></pre>
  
  <p>I wish to either add properties to first list(without having to create a second list at all)
  Or just as a last measure merge both lists.</p>