Add project files.

App.xaml

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+<Application x:Class="MVVM_DEMO.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:MVVM_DEMO"
+             StartupUri="/Views/MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

App.xaml.cs

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+using System.Configuration;
+using System.Data;
+using System.Windows;
+
+namespace MVVM_DEMO
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+
+}

AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None,            //where theme specific resource dictionaries are located
+                                                //(used if a resource is not found in the page,
+                                                // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly   //where the generic resource dictionary is located
+                                                //(used if a resource is not found in the page,
+                                                // app, or any theme specific resource dictionaries)
+)]

MVVM_DEMO.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="ValueConverters\" />
+  </ItemGroup>
+
+</Project>

MVVM_DEMO.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.13.35919.96 d17.13
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MVVM_DEMO", "MVVM_DEMO.csproj", "{FBB9EB22-3115-4366-8C35-A300DA922B06}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{FBB9EB22-3115-4366-8C35-A300DA922B06}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FBB9EB22-3115-4366-8C35-A300DA922B06}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FBB9EB22-3115-4366-8C35-A300DA922B06}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FBB9EB22-3115-4366-8C35-A300DA922B06}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A0C2E5CF-A025-4D96-B992-801A8719AA75}
+	EndGlobalSection
+EndGlobal

Models/Product.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MVVM_DEMO.Models
+{
+    public class Product
+    {
+        public string ProductName { get; set; }
+        public double Price { get; set; }
+
+    }
+}

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; }
+
+    }
+}

Views/MainWindow.xaml

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+<Window x:Class="MVVM_DEMO.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:MVVM_DEMO"
+        xmlns:vm="clr-namespace:MVVM_DEMO.ViewModels"
+        mc:Ignorable="d"
+        Title="MainWindow"
+        Height="450"
+        Width="800">
+    <Window.DataContext>
+        <vm:MainViewModel />
+    </Window.DataContext>
+
+    <Grid>
+        <StackPanel>
+            <ComboBox x:Name="comboBox"
+                      Width="200"
+                      Height="30"
+                      Margin="10"
+                      VerticalAlignment="Top"
+                      ItemsSource="{Binding Products}"
+                      DisplayMemberPath="ProductName" />
+            <Button x:Name="btnAddProduct"
+                    Content="Add Product"
+                    Width="100px"
+                    Height="25px"
+                    Click="btnAddProduct_Click" />
+            <Label Content="Selected Product Details"
+                   FontWeight="Bold"
+                   FontSize="16"
+                   Margin="10" />
+            <TextBox x:Name="txtProductName"
+                     Width="200"
+                     Height="30"
+                     Text="{Binding productName}" 
+                     />
+            <TextBox x:Name="txtProductPrice"
+                     Width="200"
+                     Height="30"
+                     Text="{Binding productPrice}" />
+        </StackPanel>
+    </Grid>
+</Window>

Views/MainWindow.xaml.cs

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+using MVVM_DEMO.Models;
+using MVVM_DEMO.ViewModels;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace MVVM_DEMO
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        MainViewModel viewModel = new MainViewModel();
+
+        public MainWindow()
+        {
+            InitializeComponent();
+            this.DataContext = viewModel;
+            comboBox.SelectionChanged += ComboBox_SelectionChanged;
+            // initial selection
+            if (comboBox.Items.Count > 0)
+            {
+                comboBox.SelectedIndex = 0;
+            }
+        }
+
+        private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            // display selected product details
+            if (comboBox.SelectedItem != null)
+            {
+                viewModel.productName= ((Product)comboBox.SelectedItem).ProductName;
+                viewModel.productPrice = (int)((Product)comboBox.SelectedItem).Price;
+                viewModel.OnPropertyChanged("productName");
+                viewModel.OnPropertyChanged("productPrice");
+            }
+
+        }
+
+        private void btnAddProduct_Click(object sender, RoutedEventArgs e)
+        {
+            // toevoegen van een product in het viewmodel
+            Product p = new Product();
+            p.ProductName = $"Product {viewModel.Products.Count + 1}";
+            // generate a random price between 10 and 100
+            Random rand = new Random();
+            p.Price = rand.Next(10, 100);
+            viewModel.Products.Add(p);
+        }
+    }
+}