Singleton implemented - greetings to gusmanb

PSVRToolbox/Program.cs

@@ -18,19 +18,19 @@
 
 using Newtonsoft.Json;
 using System;
-using System.Collections.Generic;
 using System.Linq;
 using System.Net;
-using System.Net.NetworkInformation;
 using System.Net.Sockets;
 using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Forms;
+using System.Threading;
 
 namespace PSVRToolbox
 {
     static class Program
     {
+        static Mutex mutex = new Mutex(true, "PSVRToolbox");
+
         /// <summary>
         /// Punto de entrada principal para la aplicación.
         /// </summary>
@@ -155,11 +155,13 @@ static void Main(string[] args)
                 return;
             }
 
-            Application.EnableVisualStyles();
-            Application.SetCompatibleTextRenderingDefault(false);
-            Application.Run(new MainForm());
+            if (mutex.WaitOne(TimeSpan.Zero, true))
+            {
+                Application.EnableVisualStyles();
+                Application.SetCompatibleTextRenderingDefault(false);
+                Application.Run(new MainForm());
+                mutex.ReleaseMutex();
+            }
         }
-
     }
-
 }