I found asp menu is very limit, but maybe I don't understand it very well, please point out for me.

On my site, the menu will change according user role, for example, some menus will should up only for admin, although I could control the display of the content according to user role, but it is better not show the menu items at all if user don't have permission to access it.

In some case, I need hide the page, user can access it by url, but it will not show on the menu.

any idea?

Is there a reason why the page would need to exist in the SiteMap?  Otherwise, it seems like the solution is to just not put the page in your web.sitemap. 
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Danny

I have made multi menu works, the below is what is in  my web.config. They all call the same class but with different filter.  I have to add one provide for each of them. I prefer a way to pass filter, something like sitemap("public") or sitemap("member"), but not likely it can work that way.

<siteMap defaultProvider="sitemapdefault" enabled="true">
      <providers>
        <clear/>
        <add name="sitemapdefault" type="LinkLibrary.LinkSiteMapProviderDefault"/>
        <add name="sitemappublic" type="LinkLibrary.LinkSiteMapProviderPublic"/>
        <add name="sitemapmember" type="LinkLibrary.LinkSiteMapProviderMember"/>
      </providers>
    </siteMap>

The above doesn't help me to display different menus when public login as member, unless I changed the sitemapprovide from "sitemappublic" to "sitemapmember" like below.

<asp:SiteMapDataSource ID="sitemap" runat="server" sitemapprovider="sitemapmember" ShowStartingNode="false" StartingNodeUrl="/main" />

But the above still can not solve my problem, how to hide "login" menuitem or change its lable from login to logout.