prs/prs.logikal/App.xaml.cs

using System.Diagnostics;
using System.Windows;

namespace PRSLogikal
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            
            string _procName = Process.GetCurrentProcess().ProcessName;
            Process[] _processes=Process.GetProcessesByName(_procName);
            if (_processes.Length > 1)
                Shutdown(0);
            
            base.OnStartup(e);
        }
    }
}