turn OFF screen saver programmatically

[DllImport("User32.dll")]
public static extern int SendMessage
    (IntPtr hWnd,
    uint Msg,
    uint wParam,
    uint lParam);

public const uint WM_SYSCOMMAND = 0x112;
public const uint SC_SCREENSAVE = 0xF140;

public enum SpecialHandles
{
    HWND_DESKTOP = 0x0,
    HWND_BROADCAST = 0xFFFF
}

public static void TurnOnScreenSaver()
{
    SendMessage(
        new IntPtr((int)SpecialHandles.HWND_BROADCAST),
        WM_SYSCOMMAND,
        SC_SCREENSAVE,
        0);
}

this code works fine. i found it from this forum.

i need another method like TurnOnScreenSaver() that stops the screen 
saver. That is i wanna turn on the screen saver first (already done) 
then on a specific condition i wanna turn off the screen saver and 
continue the process(on and off)