Product product = new Product();
 
product.Name = "Apple";
product.ExpiryDate = new DateTime(2008, 12, 28);
product.Price = 3.99M;
product.Sizes = new string[] { "Small", "Medium", "Large" };
 
string output = JsonConvert.SerializeObject(product);

//{
//  "Name": "Apple",
//  "ExpiryDate": "2008-12-28T00:00:00",
//  "Price": 3.99,
//  "Sizes": [
//    "Small",
//    "Medium",
//    "Large"
//  ]
//}

Product deserializedProduct = JsonConvert.DeserializeObject<Product>(output);

public class Program
{
    public static void Main()
    {
        Product product = new Product();

        product.Name = "Apple";
        product.ExpiryDate = new DateTime(2008, 12, 28);
        product.Price = 3.99M;
        product.Sizes = new string[] { "Small", "Medium", "Large" };

        string output = JsonConvert.SerializeObject(product, Formatting.Indented);

        // Write the json string
        Console.WriteLine(output);

        // Deserialize the json back into a real Product
        Product deserializedProduct = JsonConvert.DeserializeObject<Product>(output);

        // Write the properties
        Console.WriteLine(deserializedProduct.Name);
        Console.WriteLine(deserializedProduct.ExpiryDate);
        Console.WriteLine(deserializedProduct.Price);
        Console.WriteLine(deserializedProduct.Sizes);
    }
}

public class Product
{
    public string Name { get; set; }
    
    public DateTime ExpiryDate { get; set; }

    public decimal Price { get; set; }

    public string[] Sizes { get; set; }
}

Account account = new Account
{
    Email = "james@example.com",
    Active = true,
    CreatedDate = new DateTime(2013, 1, 20, 0, 0, 0, DateTimeKind.Utc),
    Roles = new List<string>
    {
        "User",
        "Admin"
    }
};

string json = @"{
    ""Active"": false,
    ""Roles"": [
    ""Expired""
    ]
}";

JsonConvert.PopulateObject(json, account);

// {
//   "Email": "james@example.com",
//   "Active": false,
//   "CreateDate" = "2013-01-20",
//   "Roles": [
//     "User",
//     "Admin",
//     "Expired"
//   ]
// }

new JsonSerializerSettings 
{ 
    ContractResolver = new CamelCasePropertyNamesContractResolver() 
});

using System;
using Newtonsoft.Json;

public class Program
{
    public static void Main(string[] args)
    {
        var x = Message.Empty.Add("abc");
        var json = JsonConvert.SerializeObject(x);
        
        Console.WriteLine(json);
        
        var cloneX = JsonConvert.DeserializeObject<Message>(json);
        
        Console.WriteLine(cloneX.Value);
    }
}

public class Message
{
  
  static Message _empty = new Message("");
    
  public static Message Empty 
    { 
        get 
        {
            return _empty; 
        } 
        private set 
        { 
            _empty = value; 
        } 
    }
  
    private Message(bool value) { }
    
    [JsonConstructor]
    private Message(string value)
    {
        Value = value;
    }
  
    public string Value { get; private set; }
  
    public Message Add(string value)
    {
        return new Message(Value + value);
    }
}

public class Product
{
    public string Name { get; set; }

    [JsonIgnore]
    public DateTime ExpiryDate { get; set; }

    public double Price { get; set; }

    [JsonIgnore]
    public string[] Sizes { get; set; }
}

public static void Main()
{
    var x = new Product
    {
        Name = "Apple",
        ExpiryDate = DateTime.Now,
        Price = 3.99,
        Sizes = new string[] { "S", "M", "L" }
    };

    var json = JsonConvert.SerializeObject(x);
}

// {
//   "Name": "Apple",
//   "Price": "3.99"
// }