using System;

namespace StringInterpolation
{
    class Customer
    {
        public string Name { get; set; }
        public int Age { get; set; }
    }

    class StringInterpolation
    {
        static void Main(string[] args)
        {
            Customer customer = new Customer();
            customer.Name = "Jane";
            customer.Age = 25;

            Console.WriteLine(string.Format("{0} is {1} year{{s}} old", customer.Name, customer.Age));
            Console.ReadLine();
        }
    }
}