using System;
using System.Windows.Forms;
using Microsoft.VisualBasic.ApplicationServices;
 
 
namespace OnyOne
{
  class Program : WindowsFormsApplicationBase
  {
    public Program()
    {
      this.IsSingleInstance = true;
      this.EnableVisualStyles = true;
    }
 
    protected override void OnStartupNextInstance(StartupNextInstanceEventArgs _
      eventArgs)
    {
      base.OnStartupNextInstance(eventArgs);
      MessageBox.Show("Diese Anwendung lässt sich nur einmal" & _
        "starten!","Fehler!");
      eventArgs.BringToForeground = true;
    }
 
    [STAThread]
    static void Main(string[] args)
    {
      Program MyApp = new Program();
      MyApp.ApplicationContext.MainForm = new Form1();
      MyApp.Run(args);
    }
  }
}