Simple Questions Simple Answers - Page 520

public partial class MainWindow : Window
{
	[DllImport("user32.dll")]
	static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
	
	private int SC_MONITORPOWER = 0xF170;
	private uint WM_SYSCOMMAND = 0x0112;

	public MainWindow()
	{
		InitializeComponent();
	}

	private void Button_Click(object sender, RoutedEventArgs e)
	{
		var handle = new WindowInteropHelper(this).Handle;
		SendMessage(handle, WM_SYSCOMMAND, (IntPtr)SC_MONITORPOWER, (IntPtr)2);            
	}
}