//设置开机自启动  
string path = Application.ExecutablePath;
RegistryKey rk = Registry.LocalMachine;
RegistryKey rk2 = rk.CreateSubKey(@"Software\Microsoft\Windows\CurrentVersion\Run");
rk2.SetValue("JcShutdown", path);
rk2.Close();
rk.Close();

//"取消开机自启动
string path = Application.ExecutablePath;
RegistryKey rk = Registry.LocalMachine;
RegistryKey rk2 = rk.CreateSubKey(@"Software\Microsoft\Windows\CurrentVersion\Run");
rk2.DeleteValue("JcShutdown", false);
rk2.Close();
rk.Close();