Widow – Diff between revs 6 and 19

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 ï»¿using System;
+using System.Threading;
 using System.Windows.Forms;
 namespace Widow
+{
     internal class Program : IDisposable
+    {
+        #region Static Fields and Constants
-        #region Static Fields and Constants
+        private static readonly Mutex Mutex = new Mutex(true, Constants.AssemblyGuid);
         private static Form _form;
         ///     The main entry point for the application.
         /// </summary>
         [STAThread]
         private static void Main()
+        {
-            Application.EnableVisualStyles();
+            if (Mutex.WaitOne(TimeSpan.Zero, true))
+            {
-            Application.SetCompatibleTextRenderingDefault(false);
+                Application.SetCompatibleTextRenderingDefault(false);
-            _form = new MainForm();
+                _form = new MainForm();
-            Application.Run();
+                Application.Run();
+                Mutex.ReleaseMutex();
+                return;
+            }
+            // Foreground current other application window.
+            Natives.PostMessage(
+                (IntPtr) Natives.HWND_BROADCAST,
+                Natives.WM_SHOWME,
+                IntPtr.Zero,
+                IntPtr.Zero);
+        }
         #endregion
+    }
+}