如何使用.net WebBrowser控件实现Refresh2方法?

WinForms中的WebBrowser控件有两种刷新方法:

public void Refresh();
public void Refresh(WebBrowserRefreshOption opt);

第二个事实上是 Refresh2()

刷新2(ieRefreshConstants.REFRESH_完全刷新);

哪里

enum ieRefreshConstants {
       REFRESH_NORMAL = 0,
       REFRESH_IFEXPIRED = 1,
       REFRESH_COMPLETELY = 3
};

根据MSDN http://msdn.microsoft.com/en-us/library/aa768363(v=vs.85).aspx