title: LINQ - Group by lambda expression
body: <p>Say I have the following:</p>
  
  <pre><code>var OrderCounts = from o in Orders
                    group o by o.CustomerID into g
                    select new {
                           CustomerID = g.Key,
                           TotalOrders = g.Count()
                    };
  </code></pre>
  
  <p>How can this be converted to a Lambda expression</p>