new SPContext.Current

    using (SPSite site = new SPSite(siteUrl))
            {
                using (SPWeb web = site.OpenWeb(new Guid(webId)))
                {
                    HttpRequest request = new HttpRequest("", web.Url, "");
                    HttpContext.Current = new HttpContext(request, new HttpResponse(TextWriter.Null));
                    if (HttpContext.Current.Items["HttpHandlerSPWeb"] == null)
                        HttpContext.Current.Items["HttpHandlerSPWeb"] = web;

return SPContext.Current;                              }
            }