stop a device suspending programatically

 public class Power
        {
            private const string POWER_TIMEOUT = @"System\CurrentControlSet\Control\Power\Timeouts";
            private const string POWER_STATE_SUSPEND = @"System\CurrentControlSet\Control\Power\State\Suspend";

            [DllImport("CoreDll")]
            public static extern void SystemIdleTimerReset();

                    public static int PowerOffTime
            {
                set
                {
                      RegistryKey rktimeout = Registry.LocalMachine.OpenSubKey(POWER_TIMEOUT, true);
                    if (rktimeout != null)
                    {
                    
                        rktimeout.SetValue("ACSuspendTimeout", value, RegistryValueKind.DWord);
                                                rktimeout.SetValue("BattSuspendTimeout", value, RegistryValueKind.DWord);
                        rktimeout.Close();
                    }
                                       RegistryKey rksuspend = Registry.LocalMachine.OpenSubKey(POWER_STATE_SUSPEND, true);
                    if (rksuspend != null)
                    {
                        rksuspend.SetValue("Default", value == 0 ? 0 : 3, RegistryValueKind.DWord);
                        rksuspend.SetValue("Flags", value == 0 ? 0 : 209152, RegistryValueKind.DWord);
                        rksuspend.Close();
                    }
                }
            }
        }