looping through json array in c#

I have a json string like,

{
  "objectType": "Subscriber",
  "objectList": [
    {
      "firstName": "name1",
      "email": "email@example.com",
      "address": "exampleAddress"
    },
    {
      "firstName": "name2",
      "email": "email2@example.com",
      "address": "exampleAddress2"
    }
  ]
}

I need to parse it in my C# code. I have tried,

JavaScriptSerializer json_serializer = new JavaScriptSerializer();
object routes_list = json_serializer.DeserializeObject(myjson here);

But I can't loop through the objectList array. How can it be done?