using System;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        try 

        {

            JObject o = JObject.Parse(@"{

                'customer': {

                    'referral': null

                }

            }");

​

            string name = (string)o.SelectToken("customer.referral.name");

​

            Console.WriteLine("Name: " + name);

        }

        catch (Exception ex)

        {

            Console.WriteLine(ex.Message.ToString());

        }

    }

}