Enumerate Site collections and sites

public void GetAllSites()

         {

                SPSecurity.RunWithElevatedPrivileges(delegate()

            {

                using (SPSite site = new SPSite(SPContext.Current.Site.ID))

                //using (SPSite site = new SPSite("http://appsweb02:93"))

                {

                    using (SPWeb web = site.OpenWeb())

                    {

                        SPWebApplication webApplication = site.WebApplication; //SPContext.Current.Site.WebApplication;

                        SPSiteCollection siteCollections = webApplication.Sites;

                        string strRoot = string.Empty;

                        foreach (SPSite siteCollection in siteCollections)

                        {

                            strRoot = "http://" + siteCollection.HostName + ":" + siteCollection.Port;

                            if (!strRoot.Equals(siteCollection.Url))

                            {

                                SPWebCollection collWebsite = siteCollection.AllWebs;

                                foreach (SPWeb subSite in collWebsite)

                                {

                                    //Msg.Text += subSite.Title + "<BR>";     // SPEncode.HtmlEncode(subSite.Title) + "<BR>";

                                    //Console.Write(subSite.Url + "-" + subSite.Title + "\n");

                                    listboxSites.Items.Add(new ListItem(subSite.Title, subSite.Url));

                                    subSite.Close();

                                }

                            }

                            siteCollection.Close();

                        }

                    }

                }

            });

       

         }