private   static   Mutex   myMutex;  
  private   static   bool   requestInitialOwnership   =   true;  
  private   static   bool   mutexWasCreated;  
   
  static   void   Main()  
  {  
   
        myMutex   =   new   Mutex(requestInitialOwnership,"myExe",out   mutexWasCreated);  
        if(mutexWasCreated)  
        {  
  Application(new   Form());  
                    myMutex.WaitOne();  
        }  
  }