using Newtonsoft.Json;

Console.WriteLine("JSON");

List<Employee> employees = new List<Employee>();
employees.Add(new Employee("Park Imre", "Szolnok"));
employees.Add(new Employee("Lenti Béla", "Szeged"));
employees.Add(new Employee("Orosz Károly", "Hatvan"));
employees.Add(new Employee("Pinti József", "Szolnok"));

var json = JsonConvert.SerializeObject(employees);
Console.WriteLine(json);