Basics of Working with Multiple Classes in C#

This program has 3 class files. We are using a class file with main method. We have created two more class files > Items and StorageArea. StorageArea returns the items using Itemid.

Program.CS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace CustomerOrders
{
   class Program
   {
      static void Main(string[] args)
      {
         var sa = new StorageArea(1111, "Ujjwals Storage");
         var item = sa.FindItem(1111);
         Console.WriteLine("Returning item : \'{0}\' from warehouse \'{1}\' whose item id is: {2} ", item.itemname, sa.storageShelfName, item.itemid);
         Console.ReadKey();
      }
   }
}

StorageArea.CS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace CustomerOrders
{
   class StorageArea
   {
      public int storageShelfId { get; set; } // defining properties of storage area class
      public string storageShelfName { get; set; } // defining properties of storage area class
      public StorageArea(int sid,string sname) // defining constructor
      {
         storageShelfId=sid;
         storageShelfName=sname;
      }
      public Items FindItem(int id) //method for Items Class
      {
         Items it=new Items(){ itemid=id,itemname="IPhone 5"};
         return it;
      }
   }
}

Items.CS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace CustomerOrders
{
   class Items
   {
      public int itemid { get; set; }
      public string itemname { get; set; }
   }
}