JsonArray object serialization using C#

I have JSON object in below format.

[
   {
      "checked":true,
      "discipline":"Registered Nurse",
      "disciplineId":1,
      "specialty":"OR",
      "specialtyId":7
   },
   {
      "checked":true,
      "discipline":"Registered Nurse",
      "disciplineId":1,
      "specialty":"Ambulatory OR",
      "specialtyId":62
   },
   {
      "checked":true,
      "discipline":"Registered Nurse",
      "disciplineId":1,
      "specialty":"Pedi-OR",
      "specialtyId":101
   }
]

I would like to map the properties in below format using C#. JSON object is coming through Reader.

jobPreferencesEvent.preferred_discipline =
    reader["discipline"] != DBNull.Value ? reader["discipline"].ToString() : "0";

jobPreferencesEvent.preferred_specialty =
    reader["speciality"] != DBNull.Value ? reader["speciality"].ToString() : "0";

Could someone help me on it?