using System;
public class MyClass{
public string Prop1{get; set;}
public byte[] Prop2{get; set;}
}
public class Program
{
public static void Main()
var obj = new MyClass{
Prop1 = "hello",
Prop2 = System.Text.Encoding.UTF8.GetBytes("world")
};
var str = Newtonsoft.Json.JsonConvert.SerializeObject(obj);
Console.WriteLine("obj: " + str);