linker/cmonitor.install.win/Program.cs

namespace cmonitor.install.win
{
    internal static class Program
    {
        /// <summary>
        ///  The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Mutex mutex = new Mutex(true, System.Diagnostics.Process.GetCurrentProcess().ProcessName, out bool isAppRunning);
            if (isAppRunning == false)
            {
                Environment.Exit(1);
            }

            AppDomain.CurrentDomain.UnhandledException += (a, b) =>
            {
            };

            // To customize application configuration such as set high DPI settings or default font,
            // see https://aka.ms/applicationconfiguration.
            ApplicationConfiguration.Initialize();
            Application.Run(new MainForm());
        }
    }
}