Turn on/off monitor

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)<br />
{<br />
	switch (message)<br />
	{<br />
		case WM_SYSCOMMAND:<br />
<br />
			switch (wParam) <br />
			{	<br />
				// disable screen saver and monitor power-saving mode<br />
				case SC_SCREENSAVE:<br />
				case SC_MONITORPOWER:<br />
		  <br />
					return 0;<br />
			}<br />
<br />
			break;<br />
<br />
		case WM_DESTROY:<br />
<br />
			PostQuitMessage(0);<br />
			<br />
			return 0;<br />
	}<br />
<br />
	return DefWindowProc(hwnd, message, wParam, lParam);<br />
}<br />

<br />
using System.Runtime.InteropServices;<br />
//<br />
//inside class<br />
[DllImport("user32.dll")]<br />
private static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam);<br />
//<br />
public int WM_SYSCOMMAND	= 0x0112;<br />
public int SC_MONITORPOWER	= 0xF170;<br />
// I added a button for the event<br />
private System.Windows.Forms.Button button1;<br />
//<br />
// On button click blank out monitor<br />
//<br />
private void button1_Click(object sender, System.EventArgs e)<br />
{<br />
int result = 0;<br />
//<br />
// get handle to active form<br />
//<br />
result = SendMessage(ActiveForm.Handle.ToInt32(), WM_SYSCOMMAND, SC_MONITORPOWER, 2);<br />
//<br />
}<br />