限制程序重复执行

private void MainWindow_Load(object sender, System.EventArgs e) 
{ 

    Process[] processes=Process.GetProcessesByName("MYEXENAME"); 
      if( processes != null) 
     { 
    if( (processes.Length)== 2)  //第２个进程 
    { 
       processes[1].CloseMainWindow(); 

      } 
   } 
} 



STAThread] 
        static void Main(string[] args) 
        { 
            //保证该程序只有一个在运行 
            bool createdNew; 
            System.Threading.Mutex mutex_Application = new System.Threading.Mutex(true,"test",out createdNew); 
            if (!createdNew) 
            { 
                MessageBox.Show("本程序只允许同时运行一个！"); 
                return; 
            } 
         
            Application.Run(); 
             
        }