Add chapter 9 sample code

Chapter09/HardwareSupplies/MainWindow.xaml.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls.Primitives;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Input;
+using Microsoft.UI.Xaml.Media;
+using Microsoft.UI.Xaml.Navigation;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+
+namespace HardwareSupplies
+{
+    /// <summary>
+    /// An empty window that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            this.InitializeComponent();
+            PopulateItems();
+        }
+
+        public HardwareItem[] HardwareItems { get; set; }
+
+        private void PopulateItems()
+        {
+            HardwareItems = new HardwareItem[]
+            {
+                new HardwareItem { id = 1, name = "Wood Screw", category = "Screws", cost = 0.02M, price = 0.10M, quantity = 504 },
+                new HardwareItem { id = 2, name = "Sheet Metal Screw", category = "Screws", cost = 0.03M, price = 0.15M, quantity = 655 },
+                new HardwareItem { id = 3, name = "Drywall Screw", category = "Screws", cost = 0.02M, price = 0.11M, quantity = 421 },
+                new HardwareItem { id = 4, name = "Galvanized Nail", category = "Nails", cost = 0.04M, price = 0.16M, quantity = 5620 },
+                new HardwareItem { id = 5, name = "Framing Nail", category = "Nails", cost = 0.06M, price = 0.20M, quantity = 12000 },
+                new HardwareItem { id = 6, name = "Finishing Nail 2 inch", category = "Nails", cost = 0.02M, price = 0.11M, quantity = 1405 },
+                new HardwareItem { id = 7, name = "Finishing Nail 1 inch", category = "Nails", cost = 0.01M, price = 0.10M, quantity = 1110 },
+                new HardwareItem { id = 8, name = "Light Switch - White", category = "Electrical", cost = 0.25M, price = 1.99M, quantity = 78 },
+                new HardwareItem { id = 9, name = "Outlet - White", category = "Electrical", cost = 0.21M, price = 1.99M, quantity = 56 },
+                new HardwareItem { id = 10, name = "Outlet - Beige", category = "Electrical", cost = 0.21M, price = 1.99M, quantity = 90 },
+                new HardwareItem { id = 11, name = "Wire Ties", category = "Electrical", cost = 0.50M, price = 4.99M, quantity = 125 },
+                new HardwareItem { id = 12, name = "Switch Plate - White", category = "Electrical", cost = 0.21M, price = 2.49M, quantity = 200 }
+            };
+        }
+    }
+}