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Update WM_PAINT and function Bitblt

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I have a code which i don't understand .

int CExWnd::OnCreate(LPCREATESTRUCT lpCreateStruct)
if(CWnd::OnCreate(lpCreateStruct)==-1) return -1;
CClientDC dc(this);
return 0;
void CExWnd::OnPaint()
CClientDC dc(this); //here
Draw ( pDC ) ;

When in method OnPaint is CClientDC , WM_PAINT update automatically , if CPaintDC , it isn't . Perhaps because function Bitblt . I don't know why .

I'm not good at English . Sorry!
Thanks .

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