如何在C#中创建这个JSON？

using Newtonsoft.Json;

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public class Program
{
    public static void Main()
    {
        Person person = new Person
        {
            Name = "John",
            Age = 30
        };

        string json = JsonConvert.SerializeObject(person);

        Console.WriteLine(json);
    }
}

{"Name":"John","Age":30}