using System;

using System.Net.Http;

                using Newtonsoft.Json;  

public class Program

{

    public static void Main()

    {

        var jsonContent = new StringContent("Internal server error");

        var model = JsonConvert.DeserializeObject<TestModel>(jsonContent.ToString());

        Console.WriteLine(model);

    }

}

​

 public class TestModel

    {

        public string Name { get; set; }

        public int Age { get; set; }

​

    }