Default App structure

App.xaml

@@ -2,7 +2,7 @@
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:local="clr-namespace:Tetris"
-             StartupUri="MainWindow.xaml">
+             StartupUri="Views/MainWindow.xaml">
     <Application.Resources>
 
     </Application.Resources>

App.xaml.cs

@@ -6,12 +6,10 @@ using System.Linq;
 using System.Threading.Tasks;
 using System.Windows;
 
-namespace Tetris
+namespace Tetris {
-{
     /// <summary>
     /// Interaction logic for App.xaml
     /// </summary>
-    public partial class App : Application
+    public partial class App : Application {
-    {
     }
 }

Tetris.csproj

@@ -2,9 +2,9 @@
 
     <PropertyGroup>
         <OutputType>WinExe</OutputType>
-        <TargetFramework>net6.0-windows</TargetFramework>
         <Nullable>enable</Nullable>
         <UseWPF>true</UseWPF>
+        <TargetFramework>net6.0-windows</TargetFramework>
     </PropertyGroup>
 
 </Project>

Tetris.sln

@@ -2,6 +2,8 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Tetris", "Tetris.csproj", "{1F3B4D12-6E23-49A6-BC9C-5E274CA63B57}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TestTetris", "..\TestTetris\TestTetris\TestTetris.csproj", "{9F341BB7-7176-4DD4-8CE3-528C31F616F4}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -12,5 +14,9 @@ Global
 		{1F3B4D12-6E23-49A6-BC9C-5E274CA63B57}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{1F3B4D12-6E23-49A6-BC9C-5E274CA63B57}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{1F3B4D12-6E23-49A6-BC9C-5E274CA63B57}.Release|Any CPU.Build.0 = Release|Any CPU
+		{9F341BB7-7176-4DD4-8CE3-528C31F616F4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9F341BB7-7176-4DD4-8CE3-528C31F616F4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9F341BB7-7176-4DD4-8CE3-528C31F616F4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9F341BB7-7176-4DD4-8CE3-528C31F616F4}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal

Views/MainWindow.xaml

@@ -1,10 +1,12 @@
-<Window x:Class="Tetris.MainWindow"
+<Window x:Class="Tetris.Views.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:Tetris"
+        xmlns:viewsModels="clr-namespace:Tetris.ViewsModels"
         mc:Ignorable="d"
+        d:DataContext="{d:DesignInstance viewsModels:ViewModel, IsDesignTimeCreatable=True}"
         Title="MainWindow" Height="450" Width="800">
     <Grid>
         

Views/MainWindow.xaml.cs

@@ -12,16 +12,15 @@ using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;
+using Tetris.ViewsModels;
 
-namespace Tetris
+namespace Tetris.Views {
-{
     /// <summary>
     /// Interaction logic for MainWindow.xaml
     /// </summary>
-    public partial class MainWindow : Window
+    public partial class MainWindow : Window {
-    {
+        public MainWindow() {
-        public MainWindow()
+            DataContext = new ViewModel();
-        {
             InitializeComponent();
         }
     }

ViewsModels/ViewModel.cs

@@ -0,0 +1,12 @@
+using System.ComponentModel;
+
+namespace Tetris.ViewsModels; 
+
+public class ViewModel : INotifyPropertyChanged {
+    public event PropertyChangedEventHandler PropertyChanged;
+    
+    protected virtual void OnPropertyChanged(string propertyName) {
+        if (PropertyChanged != null)
+            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+    }
+}