using System;

class Product

{

    public Product(string name, int newID)

    {

        ItemName = name;

        ItemID = newID;

    }

​

    public string ItemName { get; set; }

    public int ItemID { get; set; }

}

​

public class Program

{

    private static void ChangeByReference(ref Product itemRef)

    {

        // Change the address that is stored in the itemRef parameter.

        itemRef = new Product("Stapler", 99999);

​

        // You can change the value of one of the properties of

        // itemRef. The change happens to item in Main as well.

        itemRef.ItemID = 12345;

    }

    private static void Change(Product itemRef)

    {

        // Change the address that is stored in the itemRef parameter.

        itemRef = new Product("Stapler", 99999);

​

        // You can change the value of one of the properties of

        // itemRef. The change happens to item in Main as well.

        itemRef.ItemID = 12345;

    }

    public static void ModifyProducts()

    {

        // Declare an instance of Product and display its initial values.

        Product item = new Product("Fasteners", 54321);

        System.Console.WriteLine("Original values in Main.  Name: {0}, ID: {1}\n",

            item.ItemName, item.ItemID);

​

        // Pass the product instance to ChangeByReference.

        Change(item);

        System.Console.WriteLine("Back in Main.  Name: {0}, ID: {1}\n",

            item.ItemName, item.ItemID);

    }

    public static void ModifyProductsByReference()

    {

        // Declare an instance of Product and display its initial values.

        Product item = new Product("Fasteners", 54321);

        System.Console.WriteLine("Original values in Main.  Name: {0}, ID: {1}\n",

            item.ItemName, item.ItemID);

​

        // Pass the product instance to ChangeByReference.

        ChangeByReference(ref item);

        System.Console.WriteLine("Back in Main.  Name: {0}, ID: {1}\n",

            item.ItemName, item.ItemID);

    }

    public static void Main()

    {

        // ModifyProductsByReference();

         ModifyProducts();

    }

}