double buffering

[EvIl_DeViL]

hi! i'm trying to make a double buffering to avoid the slow refresh
my code looks like this:

void draw(HDC hdc)
{
	HDC dc = CreateCompatibleDC(hdc);
	HBITMAP hBitmap = CreateCompatibleBitmap (hdc, 400, 240);
	SelectObject(dc, hBitmap);

	/*draw all the stuff on dc*/

	BitBlt(hdc, 0, 0, 400, 240, dc, 0, 0, SRCCOPY);

	ReleaseDC(0, dc);
	DeleteObject(hBitmap);
	DeleteDC(dc);

	return;
}

where the hdc passed is the main hdc.
it draws but the refresh is slow. i know that is a working method because if i comment out BitBlt(hdc, 0, 0, 400, 240, dc, 0, 0, SRCCOPY); i get a black screen...