Deserializing JSON objects as List<type> not working with asmx service

public class person
{
    public person()
    {
        //
        // TODO: Add constructor logic here
        //
    }

    public int seq
    {
        get;
        set;
     }

    public string firstName
    {
        get;
        set;
     }
     public string lastName
     {
        get;
        set;
     }

}

[{"seq":1,"firstName":"Chris","lastName":"Westbrook"},
{"seq":2,"firstName":"sayyl","lastName":"westbrook"}]

[WebMethod]
    public void updatePeople(string json)
    {
        IList<person> people =
         new JavaScriptSerializer().Deserialize<IList<person>>(json);

        //do stuff...
    }

var person=new object;
person.firstName="chris";
person.lastName="Westbrook";
person.seq=-1;
var data=new object;
data.p=person;
JSON.stringify(data);

using System;
using System.Collections.Generic;
using System.Web.Script.Serialization;

namespace Test
{
    class Program
    {
        class Person
        {
            public int SequenceNumber { get; set; }
            public string FirstName { get; set; }
            public string LastName { get; set; }
        }

        public static void Main()
        {
            string json = "[{"SequenceNumber":1,"FirstName":"FN1","LastName":"LN1"},{"SequenceNumber":2,"FirstName":"FN2","LastName":"LN2"}]";
            IList<Person> persons = new JavaScriptSerializer()
                .Deserialize<IList<Person>>(json);
            Console.WriteLine(persons.Count);
        }
    }
}