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

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;            }         }      }   }}

to force running only one instace of a program in .net (C#) use this code in program.cs file:

public static Process PriorProcess()    // Returns a System.Diagnostics.Process pointing to    // a pre-existing process with the same name as the    // current one, if any; or null if the current process    // is unique.    {        Process curr = Process.GetCurrentProcess();        Process[] procs = Process.GetProcessesByName(curr.ProcessName);        foreach (Process p in procs)        {            if ((p.Id != curr.Id) &&                (p.MainModule.FileName == curr.MainModule.FileName))                return p;        }        return null;    }

and the folowing:

[STAThread]    static void Main()    {        if (PriorProcess() != null)        {            MessageBox.Show("Another instance of the app is already running.");            return;        }        Application.EnableVisualStyles();        Application.SetCompatibleTextRenderingDefault(false);        Application.Run(new Form());    }

This is what I use in my application:

static void Main(){  bool mutexCreated = false;  System.Threading.Mutex mutex = new System.Threading.Mutex( true, @"Local\slimCODE.slimKEYS.exe", out mutexCreated );  if( !mutexCreated )  {    if( MessageBox.Show(      "slimKEYS is already running. Hotkeys cannot be shared between different instances. Are you sure you wish to run this second instance?",      "slimKEYS already running",      MessageBoxButtons.YesNo,      MessageBoxIcon.Question ) != DialogResult.Yes )    {      mutex.Close();      return;    }  }  // The usual stuff with Application.Run()  mutex.Close();}