从API响应创建xml

我有以下应用程序，用于发出GET请求，以JSON格式返回数据:

class Program
{
    static void Main(string[] args)
    {
        RunAsync().Wait();
    }
    static async Task RunAsync()
    {
        using (var client = new HttpClient())
        {
            //Send HTTP request
            client.BaseAddress = new Uri("httpMyURI");
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            HttpResponseMessage response = await client.GetAsync("api/people/.....");
            if (response.IsSuccessStatusCode)
            {
                var person = response.Content.ReadAsAsync<IEnumerable<Persons>>().Result;
                foreach (var i in person)
                {
                    Console.WriteLine("{0}'t{1}-{2}", i.FirstName, i.LastName, i.Peopleid); 
                }
            }
        }
    }
}
class Persons
{
    public string Peopleid { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

我如何从我得到的结果创建一个xml文件?我想我首先要转换JSON到xml然后创建一个xml文件?