/// <summary>
/// A private helper method used to retrieve current display settings as a DEVMODE object.
/// </summary>
/// <remarks>
/// Internally calls EnumDisplaySettings() native function with the value ENUM_CURRENT_SETTINGS (-1) to retrieve the current settings.
/// </remarks>
private static SafeNativeMethods.DEVMODE GetDeviceMode()
{
SafeNativeMethods.DEVMODE mode = new SafeNativeMethods.DEVMODE();
mode.Initialize();
if (SafeNativeMethods.EnumDisplaySettings(null, SafeNativeMethods.ENUM_CURRENT_SETTINGS, ref mode))
return mode;
else
throw new InvalidOperationException(GetLastError());
}