diff --git a/App.Cmd/Program.cs b/App.Cmd/Program.cs
index dadfda0..e7abe30 100644
--- a/App.Cmd/Program.cs
+++ b/App.Cmd/Program.cs
@@ -1,12 +1,22 @@
 using App.Cmd.Views;
 using App.Core.Services;
+using static System.Net.Mime.MediaTypeNames;
 
 namespace App.Cmd
 {
     internal class Program
     {
+        //Mutex to have app in mono-instance
+        static Mutex mutex = new Mutex(true, "{EasySaveMutex}");
         static void Main(string[] args)
         {
+            if (!mutex.WaitOne(TimeSpan.Zero, true))
+            {
+                
+                return;
+            }
+
+            mutex.ReleaseMutex();
             // Check if the arguments are null
             ArgumentNullException.ThrowIfNull(args);
 
diff --git "a/Diagramme D'activit\342\200\232.png" "b/Diagramme D'activit\342\200\232.png"
new file mode 100644
index 0000000..8d330f6
Binary files /dev/null and "b/Diagramme D'activit\342\200\232.png" differ
diff --git a/Diagramme cas utilisation.png b/Diagramme cas utilisation.png
new file mode 100644
index 0000000..7c64138
Binary files /dev/null and b/Diagramme cas utilisation.png differ
diff --git a/Diagramme de classe.png b/Diagramme de classe.png
new file mode 100644
index 0000000..7ba6074
Binary files /dev/null and b/Diagramme de classe.png differ
diff --git "a/Diagramme de s\342\200\232quence.png" "b/Diagramme de s\342\200\232quence.png"
new file mode 100644
index 0000000..b35a987
Binary files /dev/null and "b/Diagramme de s\342\200\232quence.png" differ
diff --git a/EasySave.sln b/EasySave.sln
index 3a490ac..10723d4 100644
--- a/EasySave.sln
+++ b/EasySave.sln
@@ -7,7 +7,16 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "App.Core", "App.Core\App.Co
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "App.Cmd", "App.Cmd\App.Cmd.csproj", "{087719F3-E5C7-4EB9-9B26-28D8B2170BEC}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WpfApp", "WpfApp\WpfApp.csproj", "{F73113F9-BA17-40D8-9F89-4A5EC3D9EA00}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WpfApp", "WpfApp\WpfApp.csproj", "{F73113F9-BA17-40D8-9F89-4A5EC3D9EA00}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "UML-DOCS", "UML-DOCS", "{03939F2F-7210-443E-AF82-5C14D233CFDE}"
+	ProjectSection(SolutionItems) = preProject
+		\\.psf\Home\Downloads\Livrable 2 Louis JAGUENEAU Paul PESHCEL Nathan LORIT Julien DESPREZ\Diagramme cas utilisation.png = \\.psf\Home\Downloads\Livrable 2 Louis JAGUENEAU Paul PESHCEL Nathan LORIT Julien DESPREZ\Diagramme cas utilisation.png
+		\\.psf\Home\Downloads\Livrable 2 Louis JAGUENEAU Paul PESHCEL Nathan LORIT Julien DESPREZ\Diagramme D'activit‚.png = \\.psf\Home\Downloads\Livrable 2 Louis JAGUENEAU Paul PESHCEL Nathan LORIT Julien DESPREZ\Diagramme D'activit‚.png
+		\\.psf\Home\Downloads\Livrable 2 Louis JAGUENEAU Paul PESHCEL Nathan LORIT Julien DESPREZ\Diagramme de classe.png = \\.psf\Home\Downloads\Livrable 2 Louis JAGUENEAU Paul PESHCEL Nathan LORIT Julien DESPREZ\Diagramme de classe.png
+		\\.psf\Home\Downloads\Livrable 2 Louis JAGUENEAU Paul PESHCEL Nathan LORIT Julien DESPREZ\Diagramme de s‚quence.png = \\.psf\Home\Downloads\Livrable 2 Louis JAGUENEAU Paul PESHCEL Nathan LORIT Julien DESPREZ\Diagramme de s‚quence.png
+		\\.psf\Home\Downloads\Livrable 2 Louis JAGUENEAU Paul PESHCEL Nathan LORIT Julien DESPREZ\Livrable 2 EasySavez.pdf = \\.psf\Home\Downloads\Livrable 2 Louis JAGUENEAU Paul PESHCEL Nathan LORIT Julien DESPREZ\Livrable 2 EasySavez.pdf
+	EndProjectSection
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
diff --git a/Livrable 2 EasySavez.pdf b/Livrable 2 EasySavez.pdf
new file mode 100644
index 0000000..a248009
Binary files /dev/null and b/Livrable 2 EasySavez.pdf differ
diff --git a/WpfApp/App.xaml.cs b/WpfApp/App.xaml.cs
index bf4b92a..097dee2 100644
--- a/WpfApp/App.xaml.cs
+++ b/WpfApp/App.xaml.cs
@@ -1,14 +1,29 @@
-using System.Configuration;
-using System.Data;
+using System;
+using System.Threading;
 using System.Windows;
 
 namespace WpfApp
 {
-    /// <summary>
-    /// Interaction logic for App.xaml
-    /// </summary>
     public partial class App : Application
     {
-    }
+        private static Mutex _mutex = null;
+
+        protected override void OnStartup(StartupEventArgs e)
+        {
+            const string appName = "MyAppName";
+            bool createdNew;
+
+            _mutex = new Mutex(true, appName, out createdNew);
 
+            if (!createdNew)
+            {
+                // L'application est déjà en cours d'exécution
+                MessageBox.Show("L'application est déjà en cours d'exécution.", "Erreur", MessageBoxButton.OK, MessageBoxImage.Error);
+                Current.Shutdown();
+                return;
+            }
+
+            base.OnStartup(e);
+        }
+    }
 }