using System;

public class Program

{

    class Product

    {

        private string Name;

        private string model; 

        private int quantity;

        public string name

        {

            get

            {

                return Name;

            }

            set

            {

                if ((value == null) || (value == ""))

                    throw new ArgumentException("You cannot set value to null or empty");

                else

                    Name = value;

            }

        }

    }

    public static void Main()

    {

        Product r = new Product{name = "object"};

        Console.WriteLine(r.name);

    }

}