using System;

public class Program

{

    public class Product

    {

        public string ProductCode { get;set;}

        public string ProductName { get;set;}

        public string ProductDescription { get;set;}

        public int ProductPrice { get;set;}

        public Product(string Code, string Name, string Description, int Price)

        {

            if(String.IsNullOrWhiteSpace(Code))

                throw new ArgumentNullException("Product Code cannot be empty");

            else

                this.ProductCode =Code;

            if(String.IsNullOrWhiteSpace(Name))

                throw new ArgumentNullException("Product Name cannot be empty");

            else

                this.ProductName= Name;

            if(String.IsNullOrWhiteSpace(Description))

                throw new ArgumentNullException("Product Description cannot be empty");

            else

                this.ProductDescription = Description;

            if(Price <=0 )

                throw new ArgumentNullException("Product Price should be greater than 0");

            else

                this.ProductPrice= Price;

        }

        public void DisplayValues()

        {

            Console.WriteLine("Product Code - {0}", this.ProductCode);

            Console.WriteLine("Product Name - {0}", this.ProductName);  

            Console.WriteLine("Product Description - {0}", this.ProductDescription);

            Console.WriteLine("Product Price - {0}", this.ProductPrice);

        }

    }

    public static void Main()

    {

        try

        {

            Console.WriteLine("With null value");

            Product prod1 = new Product(null, null,null,2);

            prod1.DisplayValues();

        }

        catch(Exception e)

        {

            Console.WriteLine(e.Message);

        }

        Console.WriteLine("\nWithout null values");

        Product prod2 = new Product("640", "Nokia 640 XL","Nokia 640 XL LTE",15000);

        prod2.DisplayValues();

    }

}