(1)Item.cs using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace LearnDotnet { internal class Item { string itemName; public Item(string itemName) { this.itemName = itemName; } public string GetItemName() { return this.itemName; } } } (2)App.cs using System; using System.Collections.Generic; using System.Linq; using System.N..