Model in C#

Model.cs

using System;
using Newtonsoft.Json;
using System.IO;


namespace Test
{

    public class Model
    {
        public const string FileName = "Model.json";
    }

    public static class ModelExtension
    {
        public static T Load<T>(this T model) where T : Model
        {
            string text;
            if (File.Exists(Model.FileName))
            {
                text = File.ReadAllText(Model.FileName);
            }
            else
            {
                text = "{}";
            }
            var d = JsonConvert.DeserializeObject<T>(text);
            Console.WriteLine($"Deserialized: <{d}>");
            return d;
        }

        public static void Save<T>(this T model) where T : Model
        {
            var s = JsonConvert.SerializeObject(model, Formatting.Indented);
            Console.WriteLine($"Serialized: <{s}>");
            File.WriteAllText(Model.FileName, s);
        }
    }

    public static class Storage
    {
        public static T Load<T>() where T : Model
        {
            string text;
            if (File.Exists(Model.FileName))
            {
                text = File.ReadAllText(Model.FileName);
            }
            else
            {
                text = "{}";
            }
            var d = JsonConvert.DeserializeObject<T>(text);
            Console.WriteLine($"Deserialized: <{d}>");
            return d;
        }

        public static void Save<T>(T model) where T : Model
        {
            var s = JsonConvert.SerializeObject(model, Formatting.Indented);
            Console.WriteLine($"Serialized: <{s}>");
            File.WriteAllText(Model.FileName, s);
        }
    }

    public class Data : Model
    {
        public int p1 { get; set; }
        public float p2 { get; set; }
        public string p3 { get; set; }
    }

    class Test
    {
        static void Main(string[] args)
        {
            // version 1
            var d1 = Storage.Load<Data>();
            Storage.Save(d1);

            // versino 2
            var d2 = new Data().Load();
            d2.Save();
        }
    }
}