Be carefull when you decide to use AllWebs property of SPSite. Some user that doesn't have access to all site might receive Access Denied error. So , I suggest to use GetSubwebsForCurrentUser() method of SPWeb.

For example look at this following code

  StringBuilder sb = new StringBuilder();
  foreach(SPWeb web in SPContext.Current.Site.AllWebs)
  {
        sb.AppendFormat("Title : {0}<br>",web.Title);
  }

For user who has access to all subsite, the code will be fine. Unfortunatelly, for some users who only has access to some subsite, they will receive Access Denied error.

Therefore change to code into

 StringBuilder sb = new StringBuilder();
 foreach(SPWeb web in SPContext.Current.Web.GetSubwebsForCurrentUser())
 {    
   sb.AppendFormat("Title : {0}<br>",web.Title);
 }

And no more access denied problem.

-Riwut Libinuko-

Since method AllWebs also returns object for root SPWeb for Site. It will be more correct to look so.

StringBuilder sb = new StringBuilder();

SPWeb rootWeb = SPContext.Current.Site.RootWeb;

sb.AppendFormat("Title : {0}<br>", rootWeb .Title);

foreach(SPWeb web in rootWeb.GetSubwebsForCurrentUser() )

{

sb.AppendFormat("Title : {0}<br>",web.Title);

}