Student handleiding added

Models/Product.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Linq;
+using System.Runtime.CompilerServices;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -8,8 +10,35 @@ namespace MVVM_DEMO.Models
 {
     public class Product
     {
-        public string ProductName { get; set; }
-        public double Price { get; set; }
+        private string _productName;
+        private decimal _productPrice;
+
+        public string ProductName
+        {
+            get => _productName;
+            set
+            {
+                _productName = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public decimal ProductPrice
+        {
+            get => _productPrice;
+            set
+            {
+                _productPrice = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
 
     }
 }