I am getting Unhandle exception in MFC ,while using this code ,Help me out?

     BOOL CDialog::PreTranslateMessage(MSG* pMsg)
      {

     if (pMsg->message == WM_KEYDOWN)
     {
         if(pMsg->wParam == VK_SPACE && pMsg->wParam == VK_SHIFT)
      {
                AfxMessageBox("Key is pressed");
       }

         return CDialog::PreTranslateMessage(pMsg);
}