Iterating through all Web Applications,Site Collections,Sites,Lists and Libraries and Items in a SharePoint farm

private void TraversFarm()

        {

            SPFarm farm = SPFarm.Local;

            foreach (SPService curService in farm.Services)

            {

                if (curService is SPWebService)

                {

                    SPWebService webService = (SPWebService)curService;

                    foreach (SPWebApplication webApp in webService.WebApplications)

                    {

                        foreach (SPSite site in webApp.Sites)

                        {

                            using (SPWeb web = site.OpenWeb())

                            {

                                foreach (SPList list in web.Lists)

                                {

                                    foreach (SPListItem item in list.Items)

                                    {

                                        //DO Something here

                                    }

                                }

                            }

                        }

                    }

                }

            }

        }