How do I keep this from happening? I think it might be causing another bug where the program just displays default settings.

Code:
void CTestAppDlg::OnSelectpizzasize()
{	
	switch (m_intPizzaSize)
	{
	case 0:
		m_strOrderInfo = "Small Pizza";
		break;
	case 1:
		m_strOrderInfo = "Medium Pizza";
		break;
	case 2:
		m_strOrderInfo = "Large Pizza";
		break;
	default:
		m_strOrderInfo = "Test";
		break;
	}

	UpdateData(FALSE);
}