How to force C# .net app to run only one instance in Windows? [duplicate]

by

I prefer a mutex solution similar to the following. As this way it re-focuses on the app if it is already loaded

using System.Threading;

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool SetForegroundWindow(IntPtr hWnd);

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
   bool createdNew = true;
   using (Mutex mutex = new Mutex(true, "MyApplicationName", out createdNew))
   {
      if (createdNew)
      {
         Application.EnableVisualStyles();
         Application.SetCompatibleTextRenderingDefault(false);
         Application.Run(new MainForm());
      }
      else
      {
         Process current = Process.GetCurrentProcess();
         foreach (Process process in Process.GetProcessesByName(current.ProcessName))
         {
            if (process.Id != current.Id)
            {
               SetForegroundWindow(process.MainWindowHandle);
               break;
            }
         }
      }
   }
}

More Related Contents:

  1. How can I run another application within a panel of my C# program?
  2. How do I get the title of the current active window using c#?
  3. How to detect Windows shutdown or logoff
  4. Winforms: Application.Exit vs Environment.Exit vs Form.Close
  5. How can I detect when Windows 10 enters tablet mode in a Windows Forms application?
  6. How do I minimize a WinForms application to the notification area?
  7. What does “Beta: Use Unicode UTF-8 for worldwide language support” actually do?
  8. Implementing INotifyPropertyChanged – does a better way exist?
  9. How to return a value from a Form in C#?
  10. Does C# have an equivalent to JavaScript’s encodeURIComponent()?
  11. How do I get information about recently connected USB device?
  12. Creating Custom Picturebox with Draggable and Resizable Selection Window
  13. CRUD Operations using DataGridView, DataTable and DataAdapter – Cannot add new row to DataGridView
  14. Image is not drawn at the correct spot
  15. How can user resize control at runtime in winforms
  16. Transparent window layer that is click-through and always stays on top
  17. Simple animation using C#/Windows Forms
  18. Wait for file to be freed by process
  19. “MoveFile” function in C# (Delete file after reboot)
  20. Any trick to use opacity on a panel in Visual Studio Window Form?
  21. center MessageBox in parent form [duplicate]
  22. How do I disable some dates on a DateTimePicker control?
  23. Domain credentials for a WebClient class don’t work
  24. How to create a User Control with rounded corners?
  25. How to create vertical navigation bar in Windows Forms?
  26. Make a BackgroundWorker do several operations sequentially without freezing the form
  27. Memory limitations in a 64-bit .Net application?
  28. How to determine the size of a string given a font
  29. RichTextBox Newline Conversion?
  30. Winform form closed event

Leave a Comment