public static extern bool EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE devMode);
static extern DispChange ChangeDisplaySettingsEx(string lpszDeviceName, ref DEVMODE lpDevMode, IntPtr hwnd, uint dwflags, IntPtr lParam);
static extern bool EnumDisplaySettingsEx(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode, uint dwFlags);
public static extern DispChange ChangeDisplaySettings(ref DEVMODE devMode, int flags);