Add project files.

ViewModels/MainViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using MVVM_DEMO.Models;
+
+namespace MVVM_DEMO.ViewModels
+{
+    public class MainViewModel : INotifyPropertyChanged
+    {
+        
+    
+        private ObservableCollection<Product> _products;
+
+        public event PropertyChangedEventHandler? PropertyChanged;
+
+        public void OnPropertyChanged(string propertyName)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        // constructor
+
+        public MainViewModel()
+        {
+            _products = new ObservableCollection<Product>();
+            LoadData();
+        }
+
+        // read data
+        private  void LoadData()
+        {
+            _products.Add(new Product { ProductName = "Product 1", Price = 10.0 });
+            _products.Add(new Product { ProductName = "Product 2", Price = 20.0 });
+            _products.Add(new Product { ProductName = "Product 3", Price = 30.0 });
+            Products = _products;
+        }
+
+
+        // properties
+        public ObservableCollection<Product> Products { get; set; }
+
+        public string productName { get; set; }
+        public int productPrice { get; set; }
+
+    }
+}