title: How to add some property to OData query result?
body: <p>I am working on a webapi project and i used OData for manipulating the result of my apis.
  Now, I have a problem. I want to add some property to my result.
  Suppose this is the normal result:</p>
  
  <pre><code>[{
     TotalPrice: 69000,
     Id : 1
  },
  {
    TotalPrice: 51000,
    Id : 2
  }]
  </code></pre>
  
  <p>Now, I want to have a <code>json</code> like this:</p>
  
  <pre><code>{
     Orders : [{
               TotalPrice: 69000,
               Id : 1
             },
             {
               TotalPrice: 51000,
               Id : 2
             }],
     GrandTotal : 120000
  }
  </code></pre>
  
  <p>without affecting the OData Query functionality. How?</p>