C# winform程序限制重复运行

  限制重复运行

 static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);


            System.Threading.Mutex mutex = new System.Threading.Mutex(false, Application.ProductName);

            if (!mutex.WaitOne(0, false)) 
            {
                mutex.Close();
                mutex = null;
            }
            if (mutex != null)
            {

                Application.Run(new Form1());
            }
            else
            {
                MessageBox.Show("程序已经启动!" ,"提示.....",MessageBoxButtons.OK,MessageBoxIcon.Error  );
            }
        }
    }