How to iterate the object and print the property and value?

{
"url": "http://google.com",
"Viewmodel": {
              "recipientId": 0,
              "firstName": null,
              "lastName": null
            }
}

//get the Json filepath
string file = Server.MapPath("~/App_Data/output.json");
//deserialize JSON from file
string stringobj = System.IO.File.ReadAllText(file);
JavaScriptSerializer ser = new JavaScriptSerializer();
Object o= ser.Deserialize<Object>(stringobj);
foreach (var item in o)
{
// print the property but how ?
// print the value but how?
}