title: how to remove $id during JSON serialization
body: <p>I am using NewtonSoft.JSON. When running</p>
  
  <pre class="lang-cs prettyprint-override"><code>JsonConvert.SerializeObject(myObject)
  </code></pre>
  
  <p>it is adding an <code>$id</code> value to my JSON - like this:</p>
  
  <pre><code>  "$id": "1",
    "BookingId": 0,
    "CompanyId": 0,
    "IsCashBooking": false,
    "PaymentMethod": 0,
    "IsReferral": false,
    "IsReferralPercent": false,
    "ReferralPaymentType": 0,
    "ReferralDues": 0,
    "PassengerId": 0,
    "DepartmentID": 0,
    "CostCenterID": 0,
    "DeadMiles": 0
  </code></pre>
  
  <p>Can we remove this <code>$id</code> with some JsonSerializerSettings or by any other method?</p>
  
  <p>If yes - then how...</p>