C# - serialize object to JSON (.NET Framework 4.8)

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// Tested on .NET Framework 4.8

using System;
using System.IO;
using System.Text;
using Newtonsoft.Json; // <---- install it with NuGet (https://www.nuget.org/packages/Newtonsoft.Json/)

public class Program
{
    public static void Main()
    {
        User user = new User { Id = 1, Name = "Jan Kowalski", Age = 30 };
        string json = SerializeJson(user);

        Console.WriteLine(json);  // {"Id":1,"Name":"Jan Kowalski","Age":30}
    }

    public static string SerializeJson<T>(T obj)
    {
        JsonSerializer serializer = new JsonSerializer();

        using (MemoryStream stream = new MemoryStream())
        using (TextWriter writer = new StreamWriter(stream, Encoding.UTF8))
        {
            serializer.Serialize(writer, obj);
            writer.Flush();

            return Encoding.UTF8.GetString(stream.ToArray());
        }
    }
}

public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
}