I need to serialize/deserialize save/get in this JSON type in a Windows Forms C# project.

This project is used to save information from CAN variables.

[
  {
    "Nome": "Esp 03",
    "Local": "Praça,
    "IP": "192.168.1.212",
    "Variables":[{
      "Nome":"RPM",
      "id":"0X12",
      "Startbit": 1,
      "Length": 3,
      "Factor": 0.1,
      "Offset":1
    },
    {
      "Nome":"Pedal",
      "id":"0X12",
      "Startbit": 5,
      "Length": 1,
      "Factor": 1,
      "Offset":0
    }]
  }
]

How can I do this?

I trying with this code:

namespace PuxadinhoSGE
{
    class Variables
    {
        public string Nome { get; set; }
        public int Id { get; set; }

        public int Startbit { get; set; }
        public int Length { get; set; }

        public float Factor { get; set; }
        public float Offset { get; set; }
    }
    
    class Dispostivo
    {
        public string Nome { get; set; }
        public string Local { get; set; }
        public string IP { get; set; }
        public ListView Variables { get; set; }

        public string JsonSerializar(Dispostivo device)
        {
            Dispostivo Temp = new Dispostivo();
            Temp.Nome = device.Nome;
            Temp.Local = device.Local;
            Temp.IP = device.IP;

            String defaultValues = JsonConvert.SerializeObject(Temp);
            String defaultVariables = this.JsonSeriaLista(device.Variables)

            String ResultJson = defaultValues+defaultVariables;

            return ResultJson;
        }

        public string JsonSeriaLista(ListView lista) 
        {
            var defaultVariables = JsonConvert.SerializeObject(lista, Formatting.Indented);
            return defaultVariables.Equals(defaultVariables);
        }

        public static Dispostivo JsonDesserializar(string Json)
        {
            return JsonConvert.DeserializeObject<Dispostivo>(Json);
        }
    }
}

But, I don’t get the correct, expected result. Any idea how to get the correct response?