Release for 1.0.15 to fix mutex + black out.

BodyshopUploader/App.xaml.cs

@@ -1,12 +1,16 @@
-using Microsoft.Win32;
+using Hardcodet.Wpf.TaskbarNotification;
+using Microsoft.Win32;
 using System;
 using System.Collections.Generic;
 using System.Configuration;
 using System.Data;
 using System.Diagnostics;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
+using System.Windows.Interop;
+using System.Windows.Media;
 
 namespace BodyshopPartner
 {
@@ -15,24 +19,32 @@ namespace BodyshopPartner
     /// </summary>
     public partial class App : Application
     {
+        static Mutex mutex = new Mutex(false, "ImEX Online Partner");
+
         App()
         {
             //System.Threading.Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo("es-MX");
             //System.Threading.Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo("fr-CA"); 
-
-            Process proc = Process.GetCurrentProcess();
-            int count = Process.GetProcesses().Where(p =>
-                p.ProcessName == proc.ProcessName).Count();
-
-            if (count > 1)
+            RenderOptions.ProcessRenderMode = RenderMode.SoftwareOnly; // Set to prevent Window black out from Material Desgin. https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/issues/1620
+            // Use a name unique to the application (eg include your company URL)
+            // Wait 2 seconds if contended – in case another instance
+            // of the program is in the process of shutting down.
+            if (!mutex.WaitOne(TimeSpan.FromSeconds(2), false))
             {
                 MessageBox.Show("ImEX Online Partner is already running.");
                 App.Current.Shutdown();
+                return;
             }
+
         }
 
+
+
         private void Application_Exit(object sender, ExitEventArgs e)
         {
+            
+
+            mutex.ReleaseMutex();
             Utils.PowerModeEventHandler.DisposeEventHandler();
             BodyshopPartner.Properties.Settings.Default.Save();
             Utils.QuickBooksInterop.DisconnectFromQuickBooks();