Json serialized JsonContent

JsonContent.cs

public sealed class JsonContent : StreamContent
{
    private static MediaTypeHeaderValue JsonMediaType => new MediaTypeHeaderValue("application/json");

    public JsonContent(Stream stream) : base(stream)
    {
        Headers.ContentType = JsonMediaType;
    }

    public static JsonContent Create(object value)
    {
        var stream = new MemoryStream();

        using (var sw = new StreamWriter(stream, Encoding.UTF8, 1024, true))

        using (var jtw = new JsonTextWriter(sw) { Formatting = Formatting.None })
        {
            var serializer = new JsonSerializer();

            serializer.Serialize(jtw, value);

            jtw.Flush();
        }

        stream.Seek(0, SeekOrigin.Begin);

        return new JsonContent(stream);
    }
}

static void Main()
{
      var user = new User{FirstName = "Deepu", LastName = "Madhusoodanan"};
    
      using var message = new HttpRequestMessage(HttpMethod.Post, "");
      
      message.Content = JsonContent.Create(user);
      ....
}

public class User
{
  public string FirstName {get;set;}
  
  public string LastName {get;set;}
  
}