How to avoid Access Denied error while using AllWebs

Hwile running SPSecurity.RunWithElevatedPrivileges we can brows AllWebs whithout hitting the Access denied wall (c:  Her’s how it gows

StringBuilder sb = new StringBuilder(); 
SPSecurity.RunWithElevatedPrivileges(delegate()
{
using (SPSite sitecol = new SPSite(sharePointRootSite))
{
sb.AppendFormat("{0}", "<ul>");
foreach (SPWeb web in sitecol.AllWebs)
{
if (web.DoesUserHavePermissions(login, SPBasePermissions.ViewPages))
sb.AppendFormat("<li><a href='{0}'>{1}</a></li>", web.Url, web.Title);
}
sb.AppendFormat("{0}", "</ul>");
}
});

This way you only have to show the user only the sites which he/she have promissions to se.
Another good thing is by wraping our statement in a using statement it handles the disposing of IDisposable objects by it self.
it essentially calls .Dispose() when it is done.

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