اجرای فقط یک کپی از برنامه

کد:
using System;



using System.Collections.Generic;



using System.Windows.Forms;



using System.Diagnostics;



 



namespace SingleInstanceTest



{



    static class Program



    {



        [System.Runtime.InteropServices.DllImport("user32.dll")]



        [return: System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Bool)]



        static extern bool SetForegroundWindow(IntPtr hWnd);



 



        public static bool HasPriorInstance()



        {



            Process currentProcess = Process.GetCurrentProcess();



            string fileName = currentProcess.StartInfo.FileName;



            foreach (Process process in Process.GetProcessesByName(currentProcess.ProcessName))



            {



                if (process.Id == currentProcess.Id) { continue; }



                if (process.StartInfo.FileName != fileName) { continue; }



                SetForegroundWindow(process.MainWindowHandle);



                return true;



            }



            return false;



        }



 



        [STAThread]



        static void Main()



        {



            if (!HasPriorInstance())



            {



                Application.EnableVisualStyles();



                Application.SetCompatibleTextRenderingDefault(false);



                Application.Run(new Form1());



            }



        }



    }



}