How to slow the program down?

[dragonfish]

I was trying the code below:

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void CChildView::OnMatlabTry3()
{
	// TODO: Add your command handler code here
	CDC *pDC = GetDC();
	CString i_String("");
	for (int i = 0; i < 10000000 ; i++)
	{
		i_String.Format("%d", i);
		pDC->TextOutA(300, 100, i_String);
		pDC->MoveTo(0, 0);
		pDC->LineTo(100, 300+i/10000);
	}
	pDC->DeleteDC();
}

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It is the Event Handler to the menu. When I run this part, the program is running, but it consume 40% of the CPU resource and I can't move the program window. So is there any function that I can use to slow the program down?