[Solved] How to interrupt Screen-saver under windows 8

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Have a look at the unmanaged API functions GetSystemPowerStatus and SetThreadExecutionState. Using a (thread) timer, you can periodically update the status, e.g. from a class property, and inform the system about your requirements. This is useful, if your application may allow or disallow the screensaver, depending on it’s operating state.

public class PowerManager : IDisposable
{
  [Flags]
  public enum ExecutionStateEnum : uint
  {
    LetTheSystemDecide    = 0x00,
    SystemRequired        = 0x01,
    SystemDisplayRequired = 0x02,
    UserPresent           = 0x04,
    Continuous            = 0x80000000,
  }

  [DllImport("kernel32")]
  private static extern uint SetThreadExecutionState(ExecutionStateEnum esFlags);

  public PowerManager() {}

  public Update(ExecutionStateEnum state)
  {
    SetThreadExecutionState(state);
  }
}

Update:

Then call PowerManager.Update(ExecutionStateEnum.SystemDisplayRequired) to disable the screensaver or call PowerManager.Update(ExecutionStateEnum.LetTheSystemDecide) to restore the default system behaviour (allow the screensaver).
If the method is called periodically from a timer callback, adjust the timer interval according to the configured screensaver timeout.

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solved How to interrupt Screen-saver under windows 8